Accessibility metadata on login screen

daemon.py

@@ -10572,7 +10572,11 @@ class PubServer(BaseHTTPRequestHandler):
                 msg = \
                     htmlLogin(self.server.cssCache,
                               self.server.translate,
-                              self.server.baseDir, False).encode('utf-8')
+                              self.server.baseDir,
+                              self.server.httpPrefix,
+                              self.server.domainFull,
+                              self.server.systemLanguage,
+                              False).encode('utf-8')
                 msglen = len(msg)
                 self._logout_headers('text/html', msglen, callingDomain)
                 self._write(msg)
@@ -11677,7 +11681,10 @@ class PubServer(BaseHTTPRequestHandler):
             # request basic auth
             msg = htmlLogin(self.server.cssCache,
                             self.server.translate,
-                            self.server.baseDir).encode('utf-8')
+                            self.server.baseDir,
+                            self.server.httpPrefix,
+                            self.server.domainFull,
+                            self.server.systemLanguage).encode('utf-8')
             msglen = len(msg)
             self._login_headers('text/html', msglen, callingDomain)
             self._write(msg)

webapp_login.py

@@ -11,7 +11,7 @@ import time
 from shutil import copyfile
 from utils import getConfigParam
 from utils import noOfAccounts
-from webapp_utils import htmlHeaderWithExternalStyle
+from webapp_utils import htmlHeaderWithWebsiteMarkup
 from webapp_utils import htmlFooter
 from webapp_utils import htmlKeyboardNavigation
 from theme import getTextModeLogo
@@ -51,7 +51,10 @@ def htmlGetLoginCredentials(loginParams: str,
 
 
 def htmlLogin(cssCache: {}, translate: {},
-              baseDir: str, autocomplete=True) -> str:
+              baseDir: str,
+              httpPrefix: str, domain: str,
+              systemLanguage: str,
+              autocomplete=True) -> str:
     """Shows the login screen
     """
     accounts = noOfAccounts(baseDir)
@@ -145,7 +148,10 @@ def htmlLogin(cssCache: {}, translate: {},
 
     instanceTitle = \
         getConfigParam(baseDir, 'instanceTitle')
-    loginForm = htmlHeaderWithExternalStyle(cssFilename, instanceTitle)
+    loginForm = \
+        htmlHeaderWithWebsiteMarkup(cssFilename, instanceTitle,
+                                    httpPrefix, domain,
+                                    systemLanguage)
     loginForm += '<br>\n'
     loginForm += '<form method="POST" action="/login">\n'
     loginForm += '  <div class="imgcontainer">\n'

webapp_utils.py

@@ -748,6 +748,44 @@ def htmlHeaderWithPersonMarkup(cssFilename: str, instanceTitle: str,
     return htmlStr
 
 
+def htmlHeaderWithWebsiteMarkup(cssFilename: str, instanceTitle: str,
+                                httpPrefix: str, domain: str,
+                                systemLanguage: str) -> str:
+    """html header which includes website markup
+    https://schema.org/WebSite
+    """
+    htmlStr = htmlHeaderWithExternalStyle(cssFilename, instanceTitle,
+                                          systemLanguage)
+
+    licenseUrl = 'https://www.gnu.org/licenses/agpl-3.0.en.html'
+    websiteMarkup = \
+        '    <script type="application/ld+json">\n' + \
+        '    {\n' + \
+        '      "@context" : "http://schema.org",\n' + \
+        '      "@type" : "WebSite",\n' + \
+        '      "name": "' + instanceTitle + '",\n' + \
+        '      "license": "' + licenseUrl + '",\n' + \
+        '      "inLanguage": "' + systemLanguage + '",\n' + \
+        '      "isAccessibleForFree": true,\n' + \
+        '      "genre": "https://en.wikipedia.org/wiki/Fediverse",\n' + \
+        '      "accessMode": ["textual", "visual"],\n' + \
+        '      "accessModeSufficient": ["textual"],\n' + \
+        '      "accessibilityAPI" : [ "ARIA" ],\n' + \
+        '      "accessibilityControl" : [\n' + \
+        '        "fullKeyboardControl",\n' + \
+        '        "fullTouchControl",\n' + \
+        '        "fullMouseControl"\n' + \
+        '      ],\n' + \
+        '      "encodingFormat" : [\n' + \
+        '        "text/html", "image/png", "image/webp",\n' + \
+        '        "image/jpeg", "image/gif", "text/css"\n' + \
+        '      ],\n' + \
+        '    }\n' + \
+        '    </script>\n'
+    htmlStr = htmlStr.replace('<head>\n', '<head>\n' + websiteMarkup)
+    return htmlStr
+
+
 def htmlFooter() -> str:
     htmlStr = '  </body>\n'
     htmlStr += '</html>\n'