epicyon/follow.py

__filename__ = "follow.py"
__author__ = "Bob Mottram"
__license__ = "AGPL3+"
__version__ = "1.1.0"
__maintainer__ = "Bob Mottram"
__email__ = "bob@freedombone.net"
__status__ = "Production"

from pprint import pprint
import os
from utils import isSystemAccount
from utils import getFollowersList
from utils import validNickname
from utils import domainPermitted
from utils import getDomainFromActor
from utils import getNicknameFromActor
from utils import getStatusNumber
from utils import followPerson
from posts import sendSignedJson
from posts import getPersonBox
from utils import loadJson
from utils import saveJson
from acceptreject import createAccept
from acceptreject import createReject
from webfinger import webfingerHandle
from auth import createBasicAuthHeader
from session import postJson


def preApprovedFollower(baseDir: str,
                        nickname: str, domain: str,
                        approveHandle: str,
                        allowNewsFollowers: bool) -> bool:
    """Is the given handle an already manually approved follower?
    """
    # optionally allow the news account to be followed
    if nickname == 'news' and allowNewsFollowers:
        return True

    handle = nickname + '@' + domain
    accountDir = baseDir + '/accounts/' + handle
    approvedFilename = accountDir + '/approved.txt'
    if os.path.isfile(approvedFilename):
        if approveHandle in open(approvedFilename).read():
            return True
    return False


def removeFromFollowBase(baseDir: str,
                         nickname: str, domain: str,
                         acceptOrDenyHandle: str, followFile: str,
                         debug: bool) -> None:
    """Removes a handle from follow requests or rejects file
    """
    handle = nickname + '@' + domain
    accountsDir = baseDir + '/accounts/' + handle
    approveFollowsFilename = accountsDir + '/' + followFile + '.txt'
    if not os.path.isfile(approveFollowsFilename):
        if debug:
            print('WARN: Approve follow requests file ' +
                  approveFollowsFilename + ' not found')
        return
    if acceptOrDenyHandle not in open(approveFollowsFilename).read():
        return
    approvefilenew = open(approveFollowsFilename + '.new', 'w+')
    with open(approveFollowsFilename, 'r') as approvefile:
        for approveHandle in approvefile:
            if not approveHandle.startswith(acceptOrDenyHandle):
                approvefilenew.write(approveHandle)
    approvefilenew.close()
    os.rename(approveFollowsFilename + '.new', approveFollowsFilename)


def removeFromFollowRequests(baseDir: str,
                             nickname: str, domain: str,
                             denyHandle: str, debug: bool) -> None:
    """Removes a handle from follow requests
    """
    removeFromFollowBase(baseDir, nickname, domain,
                         denyHandle, 'followrequests', debug)


def removeFromFollowRejects(baseDir: str,
                            nickname: str, domain: str,
                            acceptHandle: str, debug: bool) -> None:
    """Removes a handle from follow rejects
    """
    removeFromFollowBase(baseDir, nickname, domain,
                         acceptHandle, 'followrejects', debug)


def isFollowingActor(baseDir: str,
                     nickname: str, domain: str, actor: str) -> bool:
    """Is the given nickname following the given actor?
    """
    if ':' in domain:
        domain = domain.split(':')[0]
    handle = nickname + '@' + domain
    if not os.path.isdir(baseDir + '/accounts/' + handle):
        return False
    followingFile = baseDir + '/accounts/' + handle + '/following.txt'
    if not os.path.isfile(followingFile):
        return False
    if actor.lower() in open(followingFile).read().lower():
        return True
    followingNickname = getNicknameFromActor(actor)
    if not followingNickname:
        print('WARN: unable to find nickname in ' + actor)
        return False
    followingDomain, followingPort = getDomainFromActor(actor)
    followingHandle = followingNickname + '@' + followingDomain
    if followingPort:
        if followingPort != 80 and followingPort != 443:
            if ':' not in followingHandle:
                followingHandle += ':' + str(followingPort)
    if followingHandle.lower() in open(followingFile).read().lower():
        return True
    return False


def getMutualsOfPerson(baseDir: str,
                       nickname: str, domain: str) -> []:
    """Returns the mutuals of a person
    i.e. accounts which they follow and which also follow back
    """
    followers = \
        getFollowersList(baseDir, nickname, domain, 'followers.txt')
    following = \
        getFollowersList(baseDir, nickname, domain, 'following.txt')
    mutuals = []
    for handle in following:
        if handle in followers:
            mutuals.append(handle)
    return mutuals


def followerOfPerson(baseDir: str, nickname: str, domain: str,
                     followerNickname: str, followerDomain: str,
                     federationList: [], debug: bool) -> bool:
    """Adds a follower of the given person
    """
    return followPerson(baseDir, nickname, domain,
                        followerNickname, followerDomain,
                        federationList, debug, 'followers.txt')


def isFollowerOfPerson(baseDir: str, nickname: str, domain: str,
                       followerNickname: str, followerDomain: str) -> bool:
    """is the given nickname a follower of followerNickname?
    """
    if ':' in domain:
        domain = domain.split(':')[0]
    followersFile = baseDir + '/accounts/' + \
        nickname + '@' + domain + '/followers.txt'
    if not os.path.isfile(followersFile):
        return False
    handle = followerNickname + '@' + followerDomain

    alreadyFollowing = False

    followersStr = ''
    with open(followersFile, 'r') as fpFollowers:
        followersStr = fpFollowers.read()

    if handle in followersStr:
        alreadyFollowing = True
    elif '://' + followerDomain + \
         '/profile/' + followerNickname in followersStr:
        alreadyFollowing = True
    elif '://' + followerDomain + \
         '/channel/' + followerNickname in followersStr:
        alreadyFollowing = True
    elif '://' + followerDomain + \
         '/accounts/' + followerNickname in followersStr:
        alreadyFollowing = True

    return alreadyFollowing


def unfollowPerson(baseDir: str, nickname: str, domain: str,
                   followNickname: str, followDomain: str,
                   followFile='following.txt',
                   debug=False) -> bool:
    """Removes a person to the follow list
    """
    if ':' in domain:
        domain = domain.split(':')[0]
    handle = nickname + '@' + domain
    handleToUnfollow = followNickname + '@' + followDomain
    if not os.path.isdir(baseDir + '/accounts'):
        os.mkdir(baseDir + '/accounts')
    if not os.path.isdir(baseDir + '/accounts/' + handle):
        os.mkdir(baseDir + '/accounts/' + handle)

    filename = baseDir + '/accounts/' + handle + '/' + followFile
    if not os.path.isfile(filename):
        if debug:
            print('DEBUG: follow file ' + filename + ' was not found')
        return False
    handleToUnfollowLower = handleToUnfollow.lower()
    if handleToUnfollowLower not in open(filename).read().lower():
        if debug:
            print('DEBUG: handle to unfollow ' + handleToUnfollow +
                  ' is not in ' + filename)
        return
    with open(filename, "r") as f:
        lines = f.readlines()
    with open(filename, 'w+') as f:
        for line in lines:
            if line.strip("\n").strip("\r").lower() != handleToUnfollowLower:
                f.write(line)

    # write to an unfollowed file so that if a follow accept
    # later arrives then it can be ignored
    unfollowedFilename = baseDir + '/accounts/' + handle + '/unfollowed.txt'
    if os.path.isfile(unfollowedFilename):
        if handleToUnfollowLower not in \
           open(unfollowedFilename).read().lower():
            with open(filename, "a+") as f:
                f.write(handleToUnfollow + '\n')
    else:
        with open(unfollowedFilename, "w+") as f:
            f.write(handleToUnfollow + '\n')

    return True


def unfollowerOfPerson(baseDir: str, nickname: str, domain: str,
                       followerNickname: str, followerDomain: str,
                       debug=False) -> bool:
    """Remove a follower of a person
    """
    return unfollowPerson(baseDir, nickname, domain,
                          followerNickname, followerDomain,
                          'followers.txt', debug)


def clearFollows(baseDir: str, nickname: str, domain: str,
                 followFile='following.txt') -> None:
    """Removes all follows
    """
    handle = nickname + '@' + domain
    if not os.path.isdir(baseDir + '/accounts'):
        os.mkdir(baseDir + '/accounts')
    if not os.path.isdir(baseDir + '/accounts/' + handle):
        os.mkdir(baseDir + '/accounts/' + handle)
    filename = baseDir + '/accounts/' + handle + '/' + followFile
    if os.path.isfile(filename):
        os.remove(filename)


def clearFollowers(baseDir: str, nickname: str, domain: str) -> None:
    """Removes all followers
    """
    clearFollows(baseDir, nickname, domain, 'followers.txt')


def getNoOfFollows(baseDir: str, nickname: str, domain: str,
                   authenticated: bool,
                   followFile='following.txt') -> int:
    """Returns the number of follows or followers
    """
    # only show number of followers to authenticated
    # account holders
    # if not authenticated:
    #     return 9999
    handle = nickname + '@' + domain
    filename = baseDir + '/accounts/' + handle + '/' + followFile
    if not os.path.isfile(filename):
        return 0
    ctr = 0
    with open(filename, "r") as f:
        lines = f.readlines()
        for line in lines:
            if '#' in line:
                continue
            if '@' in line and \
               '.' in line and \
               not line.startswith('http'):
                ctr += 1
            elif ((line.startswith('http') or
                   line.startswith('dat')) and
                  ('/users/' in line or
                   '/profile/' in line or
                   '/accounts/' in line or
                   '/channel/' in line)):
                ctr += 1
    return ctr


def getNoOfFollowers(baseDir: str,
                     nickname: str, domain: str, authenticated: bool) -> int:
    """Returns the number of followers of the given person
    """
    return getNoOfFollows(baseDir, nickname, domain,
                          authenticated, 'followers.txt')


def getFollowingFeed(baseDir: str, domain: str, port: int, path: str,
                     httpPrefix: str, authenticated: bool,
                     followsPerPage=12,
                     followFile='following') -> {}:
    """Returns the following and followers feeds from GET requests.
    This accesses the following.txt or followers.txt and builds a collection.
    """
    # Show a small number of follows to non-authenticated viewers
    if not authenticated:
        followsPerPage = 6

    if '/' + followFile not in path:
        return None
    # handle page numbers
    headerOnly = True
    pageNumber = None
    if '?page=' in path:
        pageNumber = path.split('?page=')[1]
        if pageNumber == 'true' or not authenticated:
            pageNumber = 1
        else:
            try:
                pageNumber = int(pageNumber)
            except BaseException:
                pass
        path = path.split('?page=')[0]
        headerOnly = False

    if not path.endswith('/' + followFile):
        return None
    nickname = None
    if path.startswith('/users/'):
        nickname = path.replace('/users/', '', 1).replace('/' + followFile, '')
    if path.startswith('/@'):
        nickname = path.replace('/@', '', 1).replace('/' + followFile, '')
    if not nickname:
        return None
    if not validNickname(domain, nickname):
        return None

    if port:
        if port != 80 and port != 443:
            if ':' not in domain:
                domain = domain + ':' + str(port)

    if headerOnly:
        firstStr = \
            httpPrefix + '://' + domain + '/users/' + \
            nickname + '/' + followFile + '?page=1'
        idStr = \
            httpPrefix + '://' + domain + '/users/' + \
            nickname + '/' + followFile
        totalStr = \
            getNoOfFollows(baseDir, nickname, domain, authenticated)
        following = {
            '@context': 'https://www.w3.org/ns/activitystreams',
            'first': firstStr,
            'id': idStr,
            'totalItems': totalStr,
            'type': 'OrderedCollection'
        }
        return following

    if not pageNumber:
        pageNumber = 1

    nextPageNumber = int(pageNumber + 1)
    idStr = \
        httpPrefix + '://' + domain + '/users/' + \
        nickname + '/' + followFile + '?page=' + str(pageNumber)
    partOfStr = \
        httpPrefix + '://' + domain + '/users/' + nickname + '/' + followFile
    following = {
        '@context': 'https://www.w3.org/ns/activitystreams',
        'id': idStr,
        'orderedItems': [],
        'partOf': partOfStr,
        'totalItems': 0,
        'type': 'OrderedCollectionPage'
    }

    handleDomain = domain
    if ':' in handleDomain:
        handleDomain = domain.split(':')[0]
    handle = nickname + '@' + handleDomain
    filename = baseDir + '/accounts/' + handle + '/' + followFile + '.txt'
    if not os.path.isfile(filename):
        return following
    currPage = 1
    pageCtr = 0
    totalCtr = 0
    with open(filename, "r") as f:
        lines = f.readlines()
        for line in lines:
            if '#' not in line:
                if '@' in line and not line.startswith('http'):
                    # nickname@domain
                    pageCtr += 1
                    totalCtr += 1
                    if currPage == pageNumber:
                        line2 = \
                            line.lower().replace('\n', '').replace('\r', '')
                        url = httpPrefix + '://' + \
                            line2.split('@')[1] + \
                            '/users/' + \
                            line2.split('@')[0]
                        following['orderedItems'].append(url)
                elif ((line.startswith('http') or
                       line.startswith('dat')) and
                      ('/users/' in line or
                       '/profile/' in line or
                       '/accounts/' in line or
                       '/channel/' in line)):
                    # https://domain/users/nickname
                    pageCtr += 1
                    totalCtr += 1
                    if currPage == pageNumber:
                        appendStr = \
                            line.lower().replace('\n', '').replace('\r', '')
                        following['orderedItems'].append(appendStr)
            if pageCtr >= followsPerPage:
                pageCtr = 0
                currPage += 1
    following['totalItems'] = totalCtr
    lastPage = int(totalCtr / followsPerPage)
    if lastPage < 1:
        lastPage = 1
    if nextPageNumber > lastPage:
        following['next'] = \
            httpPrefix + '://' + domain + '/users/' + \
            nickname + '/' + followFile + '?page=' + str(lastPage)
    return following


def followApprovalRequired(baseDir: str, nicknameToFollow: str,
                           domainToFollow: str, debug: bool,
                           followRequestHandle: str,
                           allowNewsFollowers: bool) -> bool:
    """ Returns the policy for follower approvals
    """
    # has this handle already been manually approved?
    if preApprovedFollower(baseDir, nicknameToFollow, domainToFollow,
                           followRequestHandle, allowNewsFollowers):
        return False

    manuallyApproveFollows = False
    if ':' in domainToFollow:
        domainToFollow = domainToFollow.split(':')[0]
    actorFilename = baseDir + '/accounts/' + \
        nicknameToFollow + '@' + domainToFollow + '.json'
    if os.path.isfile(actorFilename):
        actor = loadJson(actorFilename)
        if actor:
            if actor.get('manuallyApprovesFollowers'):
                manuallyApproveFollows = actor['manuallyApprovesFollowers']
            else:
                if debug:
                    print(nicknameToFollow + '@' + domainToFollow +
                          ' automatically approves followers')
    else:
        if debug:
            print('DEBUG: Actor file not found: ' + actorFilename)
    return manuallyApproveFollows


def noOfFollowRequests(baseDir: str,
                       nicknameToFollow: str, domainToFollow: str,
                       nickname: str, domain: str, fromPort: int,
                       followType: str) -> int:
    """Returns the current number of follow requests
    """
    accountsDir = baseDir + '/accounts/' + \
        nicknameToFollow + '@' + domainToFollow
    approveFollowsFilename = accountsDir + '/followrequests.txt'
    if not os.path.isfile(approveFollowsFilename):
        return 0
    ctr = 0
    with open(approveFollowsFilename, "r") as f:
        lines = f.readlines()
        if followType == "onion":
            for fileLine in lines:
                if '.onion' in fileLine:
                    ctr += 1
        elif followType == "i2p":
            for fileLine in lines:
                if '.i2p' in fileLine:
                    ctr += 1
        else:
            return len(lines)
    return ctr


def storeFollowRequest(baseDir: str,
                       nicknameToFollow: str, domainToFollow: str, port: int,
                       nickname: str, domain: str, fromPort: int,
                       followJson: {},
                       debug: bool, personUrl: str) -> bool:
    """Stores the follow request for later use
    """
    accountsDir = baseDir + '/accounts/' + \
        nicknameToFollow + '@' + domainToFollow
    if not os.path.isdir(accountsDir):
        return False

    approveHandle = nickname + '@' + domain
    domainFull = domain
    if fromPort:
        if fromPort != 80 and fromPort != 443:
            if ':' not in domain:
                approveHandle = nickname + '@' + domain + ':' + str(fromPort)
                domainFull = domain + ':' + str(fromPort)

    followersFilename = accountsDir + '/followers.txt'
    if os.path.isfile(followersFilename):
        alreadyFollowing = False

        followersStr = ''
        with open(followersFilename, 'r') as fpFollowers:
            followersStr = fpFollowers.read()

        if approveHandle in followersStr:
            alreadyFollowing = True
        elif '://' + domainFull + '/profile/' + nickname in followersStr:
            alreadyFollowing = True
        elif '://' + domainFull + '/channel/' + nickname in followersStr:
            alreadyFollowing = True
        elif '://' + domainFull + '/accounts/' + nickname in followersStr:
            alreadyFollowing = True

        if alreadyFollowing:
            if debug:
                print('DEBUG: ' +
                      nicknameToFollow + '@' + domainToFollow +
                      ' already following ' + approveHandle)
            return True

    # should this follow be denied?
    denyFollowsFilename = accountsDir + '/followrejects.txt'
    if os.path.isfile(denyFollowsFilename):
        if approveHandle in open(denyFollowsFilename).read():
            removeFromFollowRequests(baseDir, nicknameToFollow,
                                     domainToFollow, approveHandle, debug)
            print(approveHandle + ' was already denied as a follower of ' +
                  nicknameToFollow)
            return True

    # add to a file which contains a list of requests
    approveFollowsFilename = accountsDir + '/followrequests.txt'

    # store either nick@domain or the full person/actor url
    approveHandleStored = approveHandle
    if '/users/' not in personUrl:
        approveHandleStored = personUrl

    if os.path.isfile(approveFollowsFilename):
        if approveHandle not in open(approveFollowsFilename).read():
            with open(approveFollowsFilename, 'a+') as fp:
                fp.write(approveHandleStored + '\n')
        else:
            if debug:
                print('DEBUG: ' + approveHandleStored +
                      ' is already awaiting approval')
    else:
        with open(approveFollowsFilename, "w+") as fp:
            fp.write(approveHandleStored + '\n')

    # store the follow request in its own directory
    # We don't rely upon the inbox because items in there could expire
    requestsDir = accountsDir + '/requests'
    if not os.path.isdir(requestsDir):
        os.mkdir(requestsDir)
    followActivityfilename = requestsDir + '/' + approveHandle + '.follow'
    return saveJson(followJson, followActivityfilename)


def receiveFollowRequest(session, baseDir: str, httpPrefix: str,
                         port: int, sendThreads: [], postLog: [],
                         cachedWebfingers: {}, personCache: {},
                         messageJson: {}, federationList: [],
                         debug: bool, projectVersion: str,
                         allowNewsFollowers: bool,
                         maxFollowers: int) -> bool:
    """Receives a follow request within the POST section of HTTPServer
    """
    if not messageJson['type'].startswith('Follow'):
        return False
    print('Receiving follow request')
    if not messageJson.get('actor'):
        if debug:
            print('DEBUG: follow request has no actor')
        return False
    if '/users/' not in messageJson['actor'] and \
       '/accounts/' not in messageJson['actor'] and \
       '/channel/' not in messageJson['actor'] and \
       '/profile/' not in messageJson['actor']:
        if debug:
            print('DEBUG: users/profile/accounts/channel missing from actor')
        return False
    domain, tempPort = getDomainFromActor(messageJson['actor'])
    fromPort = port
    domainFull = domain
    if tempPort:
        fromPort = tempPort
        if tempPort != 80 and tempPort != 443:
            if ':' not in domain:
                domainFull = domain + ':' + str(tempPort)
    if not domainPermitted(domain, federationList):
        if debug:
            print('DEBUG: follower from domain not permitted - ' + domain)
        return False
    nickname = getNicknameFromActor(messageJson['actor'])
    if not nickname:
        # single user instance
        nickname = 'dev'
        if debug:
            print('DEBUG: follow request does not contain a ' +
                  'nickname. Assuming single user instance.')
    if not messageJson.get('to'):
        messageJson['to'] = messageJson['object']
    if '/users/' not in messageJson['object'] and \
       '/accounts/' not in messageJson['object'] and \
       '/channel/' not in messageJson['object'] and \
       '/profile/' not in messageJson['object']:
        if debug:
            print('DEBUG: users/profile/channel/accounts ' +
                  'not found within object')
        return False
    domainToFollow, tempPort = getDomainFromActor(messageJson['object'])
    if not domainPermitted(domainToFollow, federationList):
        if debug:
            print('DEBUG: follow domain not permitted ' + domainToFollow)
        return True
    domainToFollowFull = domainToFollow
    if tempPort:
        if tempPort != 80 and tempPort != 443:
            if ':' not in domainToFollow:
                domainToFollowFull = domainToFollow + ':' + str(tempPort)
    nicknameToFollow = getNicknameFromActor(messageJson['object'])
    if not nicknameToFollow:
        if debug:
            print('DEBUG: follow request does not contain a ' +
                  'nickname for the account followed')
        return True
    if isSystemAccount(nicknameToFollow):
        if not (nicknameToFollow == 'news' and allowNewsFollowers):
            if debug:
                print('DEBUG: Cannot follow system account - ' +
                      nicknameToFollow)
            return True
    if maxFollowers > 0:
        if getNoOfFollowers(baseDir,
                            nicknameToFollow, domainToFollow,
                            True) > maxFollowers:
            print('WARN: ' + nicknameToFollow +
                  ' has reached their maximum number of followers')
            return True
    handleToFollow = nicknameToFollow + '@' + domainToFollow
    if domainToFollow == domain:
        if not os.path.isdir(baseDir + '/accounts/' + handleToFollow):
            if debug:
                print('DEBUG: followed account not found - ' +
                      baseDir + '/accounts/' + handleToFollow)
            return True

    if isFollowerOfPerson(baseDir,
                          nicknameToFollow, domainToFollowFull,
                          nickname, domainFull):
        if debug:
            print('DEBUG: ' + nickname + '@' + domain +
                  ' is already a follower of ' +
                  nicknameToFollow + '@' + domainToFollow)
        return True

    # what is the followers policy?
    approveHandle = nickname + '@' + domainFull
    if followApprovalRequired(baseDir, nicknameToFollow,
                              domainToFollow, debug, approveHandle,
                              allowNewsFollowers):
        print('Follow approval is required')
        if domain.endswith('.onion'):
            if noOfFollowRequests(baseDir,
                                  nicknameToFollow, domainToFollow,
                                  nickname, domain, fromPort,
                                  'onion') > 5:
                print('Too many follow requests from onion addresses')
                return False
        elif domain.endswith('.i2p'):
            if noOfFollowRequests(baseDir,
                                  nicknameToFollow, domainToFollow,
                                  nickname, domain, fromPort,
                                  'i2p') > 5:
                print('Too many follow requests from i2p addresses')
                return False
        else:
            if noOfFollowRequests(baseDir,
                                  nicknameToFollow, domainToFollow,
                                  nickname, domain, fromPort,
                                  '') > 10:
                print('Too many follow requests')
                return False

        print('Storing follow request for approval')
        return storeFollowRequest(baseDir,
                                  nicknameToFollow, domainToFollow, port,
                                  nickname, domain, fromPort,
                                  messageJson, debug, messageJson['actor'])
    else:
        print('Follow request does not require approval')
        # update the followers
        if os.path.isdir(baseDir + '/accounts/' +
                         nicknameToFollow + '@' + domainToFollow):
            followersFilename = \
                baseDir + '/accounts/' + \
                nicknameToFollow + '@' + domainToFollow + '/followers.txt'

            # for actors which don't follow the mastodon
            # /users/ path convention store the full actor
            if '/users/' not in messageJson['actor']:
                approveHandle = messageJson['actor']

            print('Updating followers file: ' +
                  followersFilename + ' adding ' + approveHandle)
            if os.path.isfile(followersFilename):
                if approveHandle not in open(followersFilename).read():
                    try:
                        with open(followersFilename, 'r+') as followersFile:
                            content = followersFile.read()
                            followersFile.seek(0, 0)
                            followersFile.write(approveHandle + '\n' + content)
                    except Exception as e:
                        print('WARN: ' +
                              'Failed to write entry to followers file ' +
                              str(e))
            else:
                followersFile = open(followersFilename, "w+")
                followersFile.write(approveHandle + '\n')
                followersFile.close()

    print('Beginning follow accept')
    return followedAccountAccepts(session, baseDir, httpPrefix,
                                  nicknameToFollow, domainToFollow, port,
                                  nickname, domain, fromPort,
                                  messageJson['actor'], federationList,
                                  messageJson, sendThreads, postLog,
                                  cachedWebfingers, personCache,
                                  debug, projectVersion, True)


def followedAccountAccepts(session, baseDir: str, httpPrefix: str,
                           nicknameToFollow: str, domainToFollow: str,
                           port: int,
                           nickname: str, domain: str, fromPort: int,
                           personUrl: str, federationList: [],
                           followJson: {}, sendThreads: [], postLog: [],
                           cachedWebfingers: {}, personCache: {},
                           debug: bool, projectVersion: str,
                           removeFollowActivity: bool):
    """The person receiving a follow request accepts the new follower
    and sends back an Accept activity
    """
    acceptHandle = nickname + '@' + domain

    # send accept back
    if debug:
        print('DEBUG: sending Accept activity for ' +
              'follow request which arrived at ' +
              nicknameToFollow + '@' + domainToFollow +
              ' back to ' + acceptHandle)
    acceptJson = createAccept(baseDir, federationList,
                              nicknameToFollow, domainToFollow, port,
                              personUrl, '', httpPrefix,
                              followJson)
    if debug:
        pprint(acceptJson)
        print('DEBUG: sending follow Accept from ' +
              nicknameToFollow + '@' + domainToFollow +
              ' port ' + str(port) + ' to ' +
              acceptHandle + ' port ' + str(fromPort))
    clientToServer = False

    if removeFollowActivity:
        # remove the follow request json
        followActivityfilename = \
            baseDir + '/accounts/' + \
            nicknameToFollow + '@' + domainToFollow + '/requests/' + \
            nickname + '@' + domain + '.follow'
        if os.path.isfile(followActivityfilename):
            try:
                os.remove(followActivityfilename)
            except BaseException:
                pass

    return sendSignedJson(acceptJson, session, baseDir,
                          nicknameToFollow, domainToFollow, port,
                          nickname, domain, fromPort, '',
                          httpPrefix, True, clientToServer,
                          federationList,
                          sendThreads, postLog, cachedWebfingers,
                          personCache, debug, projectVersion)


def followedAccountRejects(session, baseDir: str, httpPrefix: str,
                           nicknameToFollow: str, domainToFollow: str,
                           port: int,
                           nickname: str, domain: str, fromPort: int,
                           federationList: [],
                           sendThreads: [], postLog: [],
                           cachedWebfingers: {}, personCache: {},
                           debug: bool, projectVersion: str):
    """The person receiving a follow request rejects the new follower
    and sends back a Reject activity
    """
    # send reject back
    if debug:
        print('DEBUG: sending Reject activity for ' +
              'follow request which arrived at ' +
              nicknameToFollow + '@' + domainToFollow +
              ' back to ' + nickname + '@' + domain)

    # get the json for the original follow request
    followActivityfilename = \
        baseDir + '/accounts/' + \
        nicknameToFollow + '@' + domainToFollow + '/requests/' + \
        nickname + '@' + domain + '.follow'
    followJson = loadJson(followActivityfilename)
    if not followJson:
        print('No follow request json was found for ' +
              followActivityfilename)
        return None
    # actor who made the follow request
    personUrl = followJson['actor']

    # create the reject activity
    rejectJson = \
        createReject(baseDir, federationList,
                     nicknameToFollow, domainToFollow, port,
                     personUrl, '', httpPrefix, followJson)
    if debug:
        pprint(rejectJson)
        print('DEBUG: sending follow Reject from ' +
              nicknameToFollow + '@' + domainToFollow +
              ' port ' + str(port) + ' to ' +
              nickname + '@' + domain + ' port ' + str(fromPort))
    clientToServer = False
    denyHandle = nickname + '@' + domain
    if fromPort:
        if fromPort != 80 and fromPort != 443:
            denyHandle = denyHandle + ':' + str(fromPort)
    # remove from the follow requests file
    removeFromFollowRequests(baseDir, nicknameToFollow, domainToFollow,
                             denyHandle, debug)
    # remove the follow request json
    try:
        os.remove(followActivityfilename)
    except BaseException:
        pass
    # send the reject activity
    return sendSignedJson(rejectJson, session, baseDir,
                          nicknameToFollow, domainToFollow, port,
                          nickname, domain, fromPort, '',
                          httpPrefix, True, clientToServer,
                          federationList,
                          sendThreads, postLog, cachedWebfingers,
                          personCache, debug, projectVersion)


def sendFollowRequest(session, baseDir: str,
                      nickname: str, domain: str, port: int, httpPrefix: str,
                      followNickname: str, followDomain: str,
                      followPort: int, followHttpPrefix: str,
                      clientToServer: bool, federationList: [],
                      sendThreads: [], postLog: [], cachedWebfingers: {},
                      personCache: {}, debug: bool,
                      projectVersion: str, allowNewsFollowers: bool) -> {}:
    """Gets the json object for sending a follow request
    """
    if not domainPermitted(followDomain, federationList):
        return None

    fullDomain = domain
    followActor = httpPrefix + '://' + domain + '/users/' + nickname
    if port:
        if port != 80 and port != 443:
            if ':' not in domain:
                fullDomain = domain + ':' + str(port)
                followActor = httpPrefix + '://' + \
                    fullDomain + '/users/' + nickname

    requestDomain = followDomain
    if followPort:
        if followPort != 80 and followPort != 443:
            if ':' not in followDomain:
                requestDomain = followDomain + ':' + str(followPort)

    statusNumber, published = getStatusNumber()

    if followNickname:
        followedId = followHttpPrefix + '://' + \
            requestDomain + '/users/' + followNickname
        followHandle = followNickname + '@' + requestDomain
    else:
        if debug:
            print('DEBUG: sendFollowRequest - assuming single user instance')
        followedId = followHttpPrefix + '://' + requestDomain
        singleUserNickname = 'dev'
        followHandle = singleUserNickname + '@' + requestDomain

    newFollowJson = {
        '@context': 'https://www.w3.org/ns/activitystreams',
        'id': followActor + '/statuses/' + str(statusNumber),
        'type': 'Follow',
        'actor': followActor,
        'object': followedId
    }

    if followApprovalRequired(baseDir, nickname, domain, debug,
                              followHandle, allowNewsFollowers):
        # Remove any follow requests rejected for the account being followed.
        # It's assumed that if you are following someone then you are
        # ok with them following back. If this isn't the case then a rejected
        # follow request will block them again.
        removeFromFollowRejects(baseDir,
                                nickname, domain,
                                followHandle, debug)

    sendSignedJson(newFollowJson, session, baseDir, nickname, domain, port,
                   followNickname, followDomain, followPort,
                   'https://www.w3.org/ns/activitystreams#Public',
                   httpPrefix, True, clientToServer,
                   federationList,
                   sendThreads, postLog, cachedWebfingers, personCache,
                   debug, projectVersion)

    return newFollowJson


def sendFollowRequestViaServer(baseDir: str, session,
                               fromNickname: str, password: str,
                               fromDomain: str, fromPort: int,
                               followNickname: str, followDomain: str,
                               followPort: int,
                               httpPrefix: str,
                               cachedWebfingers: {}, personCache: {},
                               debug: bool, projectVersion: str) -> {}:
    """Creates a follow request via c2s
    """
    if not session:
        print('WARN: No session for sendFollowRequestViaServer')
        return 6

    fromDomainFull = fromDomain
    if fromPort:
        if fromPort != 80 and fromPort != 443:
            if ':' not in fromDomain:
                fromDomainFull = fromDomain + ':' + str(fromPort)

    followDomainFull = followDomain
    if followPort:
        if followPort != 80 and followPort != 443:
            if ':' not in followDomain:
                followDomainFull = followDomain + ':' + str(followPort)

    followActor = httpPrefix + '://' + \
        fromDomainFull + '/users/' + fromNickname
    followedId = httpPrefix + '://' + \
        followDomainFull + '/users/' + followNickname

    statusNumber, published = getStatusNumber()
    newFollowJson = {
        '@context': 'https://www.w3.org/ns/activitystreams',
        'id': followActor + '/statuses/' + str(statusNumber),
        'type': 'Follow',
        'actor': followActor,
        'object': followedId
    }

    handle = httpPrefix + '://' + fromDomainFull + '/@' + fromNickname

    # lookup the inbox for the To handle
    wfRequest = \
        webfingerHandle(session, handle, httpPrefix, cachedWebfingers,
                        fromDomain, projectVersion)
    if not wfRequest:
        if debug:
            print('DEBUG: announce webfinger failed for ' + handle)
        return 1
    if not isinstance(wfRequest, dict):
        print('WARN: Webfinger for ' + handle + ' did not return a dict. ' +
              str(wfRequest))
        return 1

    postToBox = 'outbox'

    # get the actor inbox for the To handle
    (inboxUrl, pubKeyId, pubKey,
     fromPersonId, sharedInbox, avatarUrl,
     displayName) = getPersonBox(baseDir, session, wfRequest, personCache,
                                 projectVersion, httpPrefix, fromNickname,
                                 fromDomain, postToBox)

    if not inboxUrl:
        if debug:
            print('DEBUG: No ' + postToBox + ' was found for ' + handle)
        return 3
    if not fromPersonId:
        if debug:
            print('DEBUG: No actor was found for ' + handle)
        return 4

    authHeader = createBasicAuthHeader(fromNickname, password)

    headers = {
        'host': fromDomain,
        'Content-type': 'application/json',
        'Authorization': authHeader
    }
    postResult = \
        postJson(session, newFollowJson, [], inboxUrl, headers)
    if not postResult:
        if debug:
            print('DEBUG: POST announce failed for c2s to ' + inboxUrl)
        return 5

    if debug:
        print('DEBUG: c2s POST follow success')

    return newFollowJson


def sendUnfollowRequestViaServer(baseDir: str, session,
                                 fromNickname: str, password: str,
                                 fromDomain: str, fromPort: int,
                                 followNickname: str, followDomain: str,
                                 followPort: int,
                                 httpPrefix: str,
                                 cachedWebfingers: {}, personCache: {},
                                 debug: bool, projectVersion: str) -> {}:
    """Creates a unfollow request via c2s
    """
    if not session:
        print('WARN: No session for sendUnfollowRequestViaServer')
        return 6

    fromDomainFull = fromDomain
    if fromPort:
        if fromPort != 80 and fromPort != 443:
            if ':' not in fromDomain:
                fromDomainFull = fromDomain + ':' + str(fromPort)
    followDomainFull = followDomain
    if followPort:
        if followPort != 80 and followPort != 443:
            if ':' not in followDomain:
                followDomainFull = followDomain + ':' + str(followPort)

    followActor = httpPrefix + '://' + \
        fromDomainFull + '/users/' + fromNickname
    followedId = httpPrefix + '://' + \
        followDomainFull + '/users/' + followNickname
    statusNumber, published = getStatusNumber()

    unfollowJson = {
        '@context': 'https://www.w3.org/ns/activitystreams',
        'id': followActor + '/statuses/' + str(statusNumber) + '/undo',
        'type': 'Undo',
        'actor': followActor,
        'object': {
            'id': followActor + '/statuses/' + str(statusNumber),
            'type': 'Follow',
            'actor': followActor,
            'object': followedId
        }
    }

    handle = httpPrefix + '://' + fromDomainFull + '/@' + fromNickname

    # lookup the inbox for the To handle
    wfRequest = \
        webfingerHandle(session, handle, httpPrefix, cachedWebfingers,
                        fromDomain, projectVersion)
    if not wfRequest:
        if debug:
            print('DEBUG: announce webfinger failed for ' + handle)
        return 1
    if not isinstance(wfRequest, dict):
        print('WARN: Webfinger for ' + handle + ' did not return a dict. ' +
              str(wfRequest))
        return 1

    postToBox = 'outbox'

    # get the actor inbox for the To handle
    (inboxUrl, pubKeyId, pubKey,
     fromPersonId, sharedInbox,
     avatarUrl, displayName) = getPersonBox(baseDir, session,
                                            wfRequest, personCache,
                                            projectVersion, httpPrefix,
                                            fromNickname,
                                            fromDomain, postToBox)

    if not inboxUrl:
        if debug:
            print('DEBUG: No ' + postToBox + ' was found for ' + handle)
        return 3
    if not fromPersonId:
        if debug:
            print('DEBUG: No actor was found for ' + handle)
        return 4

    authHeader = createBasicAuthHeader(fromNickname, password)

    headers = {
        'host': fromDomain,
        'Content-type': 'application/json',
        'Authorization': authHeader
    }
    postResult = \
        postJson(session, unfollowJson, [], inboxUrl, headers)
    if not postResult:
        if debug:
            print('DEBUG: POST announce failed for c2s to ' + inboxUrl)
        return 5

    if debug:
        print('DEBUG: c2s POST unfollow success')

    return unfollowJson


def getFollowersOfActor(baseDir: str, actor: str, debug: bool) -> {}:
    """In a shared inbox if we receive a post we know who it's from
    and if it's addressed to followers then we need to get a list of those.
    This returns a list of account handles which follow the given actor
    """
    if debug:
        print('DEBUG: getting followers of ' + actor)
    recipientsDict = {}
    if ':' not in actor:
        return recipientsDict
    nickname = getNicknameFromActor(actor)
    if not nickname:
        if debug:
            print('DEBUG: no nickname found in ' + actor)
        return recipientsDict
    domain, port = getDomainFromActor(actor)
    if not domain:
        if debug:
            print('DEBUG: no domain found in ' + actor)
        return recipientsDict
    actorHandle = nickname + '@' + domain
    if debug:
        print('DEBUG: searching for handle ' + actorHandle)
    # for each of the accounts
    for subdir, dirs, files in os.walk(baseDir + '/accounts'):
        for account in dirs:
            if '@' in account and not account.startswith('inbox@'):
                followingFilename = \
                    os.path.join(subdir, account) + '/following.txt'
                if debug:
                    print('DEBUG: examining follows of ' + account)
                    print(followingFilename)
                if os.path.isfile(followingFilename):
                    # does this account follow the given actor?
                    if debug:
                        print('DEBUG: checking if ' + actorHandle +
                              ' in ' + followingFilename)
                    if actorHandle in open(followingFilename).read():
                        if debug:
                            print('DEBUG: ' + account +
                                  ' follows ' + actorHandle)
                        recipientsDict[account] = None
    return recipientsDict


def outboxUndoFollow(baseDir: str, messageJson: {}, debug: bool) -> None:
    """When an unfollow request is received by the outbox from c2s
    This removes the followed handle from the following.txt file
    of the relevant account
    """
    if not messageJson.get('type'):
        return
    if not messageJson['type'] == 'Undo':
        return
    if not messageJson.get('object'):
        return
    if not isinstance(messageJson['object'], dict):
        return
    if not messageJson['object'].get('type'):
        return
    if not messageJson['object']['type'] == 'Follow':
        return
    if not messageJson['object'].get('object'):
        return
    if not messageJson['object'].get('actor'):
        return
    if not isinstance(messageJson['object']['object'], str):
        return
    if debug:
        print('DEBUG: undo follow arrived in outbox')

    nicknameFollower = getNicknameFromActor(messageJson['object']['actor'])
    if not nicknameFollower:
        print('WARN: unable to find nickname in ' +
              messageJson['object']['actor'])
        return
    domainFollower, portFollower = \
        getDomainFromActor(messageJson['object']['actor'])
    domainFollowerFull = domainFollower
    if portFollower:
        if portFollower != 80 and portFollower != 443:
            if ':' not in domainFollower:
                domainFollowerFull = domainFollower + ':' + str(portFollower)

    nicknameFollowing = getNicknameFromActor(messageJson['object']['object'])
    if not nicknameFollowing:
        print('WARN: unable to find nickname in ' +
              messageJson['object']['object'])
        return
    domainFollowing, portFollowing = \
        getDomainFromActor(messageJson['object']['object'])
    domainFollowingFull = domainFollowing
    if portFollowing:
        if portFollowing != 80 and portFollowing != 443:
            if ':' not in domainFollowing:
                domainFollowingFull = \
                    domainFollowing + ':' + str(portFollowing)

    if unfollowPerson(baseDir, nicknameFollower, domainFollowerFull,
                      nicknameFollowing, domainFollowingFull):
        if debug:
            print('DEBUG: ' + nicknameFollower + ' unfollowed ' +
                  nicknameFollowing + '@' + domainFollowingFull)
    else:
        if debug:
            print('WARN: ' + nicknameFollower + ' could not unfollow ' +
                  nicknameFollowing + '@' + domainFollowingFull)