Changed tweets, added eca

2022-10-25 12:15:41 +02:00
parent 7597d7648a
commit 9860bee497
71 changed files with 7476 additions and 2036 deletions
--- a/eca/http.py
+++ b/eca/http.py
@@ -0,0 +1,135 @@
+import http.cookies
+import logging
+import json
+import collections
+from . import httpd
+from . import sse
+from . import fire, get_context
+from . import sessions
+
+
+# Logging
+logger = logging.getLogger(__name__)
+
+# bring some external handlers into this module's scope
+# (now you can just import eca.http and have access to all standard handlers)
+StaticContent = httpd.StaticContent
+SessionManager = sessions.SessionManager
+
+
+class Cookies(httpd.Filter):
+    """Filter to read cookies from request."""
+    def handle(self):
+        # process available cookies
+        cookies = http.cookies.SimpleCookie()
+        if 'cookie' in self.request.headers:
+            cookies.load(self.request.headers['cookie'])
+
+        # set cookies on request
+        self.request.cookies = cookies
+
+
+
+class HelloWorld(httpd.Handler):
+    """The mandatory Hello World example."""
+    def handle_GET(self):
+        self.request.send_response(200)
+        self.request.send_header('content-type','text/html; charset=utf-8')
+        self.request.end_headers()
+
+        output = "<!DOCTYPE html><html><body><h1>Hello world!</h1><p><i>eca-session:</i> {}</p></body></html>"
+
+        try:
+            if not hasattr(self.request, 'cookies'): raise KeyError()
+            cookie = self.request.cookies['eca-session'].value
+        except KeyError:
+            cookie = '<i>no cookie</i>';
+        
+        self.request.wfile.write(output.format(cookie).encode('utf-8'))
+
+
+def Redirect(realpath):
+    """
+    Factory for redirection handlers.
+    """
+    class RedirectHandler(httpd.Handler):
+        def handle_GET(self):
+            location = None
+
+            # check for absolute paths
+            if realpath.startswith("http://") or realpath.startswith('https://'):
+                location = realpath
+            else:
+                host = self.request.server.server_address[0]
+                if self.request.server.server_address[1] != 80:
+                    host += ":{}".format(self.request.server.server_address[1])
+    
+                if 'host' in self.request.headers:
+                    host = self.request.headers['host']
+    
+                location = "http://{}{}".format(host, realpath)
+
+            self.request.send_response(302)
+            self.request.send_header('content-type','text/html; charset=utf-8')
+            self.request.send_header('location',location)
+            self.request.end_headers()
+            output = "<!DOCTYPE html><html><body><p>Redirect to <a href='{0}'>{0}</a></p></body></html>"
+            self.request.wfile.write(output.format(location).encode('utf-8'))
+
+    return RedirectHandler
+
+
+def GenerateEvent(name):
+    """
+    This function returns a handler class that creates the named event based
+    on the posted JSON data.
+    """
+    class EventGenerationHandler(httpd.Handler):
+        def handle_POST(self):
+            # handle weirdness
+            if 'content-length' not in self.request.headers:
+                self.request.send_error(411)
+                return
+
+            # read content-length header
+            length = int(self.request.headers['content-length'])
+
+            # grab data
+            data = self.request.rfile.read(length)
+            try:
+                structured = json.loads(data.decode('utf-8'))
+            except ValueError as e:
+                self.request.send_error(400, "Bad request: "+str(e))
+                return
+
+            if not isinstance(structured, collections.abc.Mapping):
+                self.request.send_error(400, "Bad request: expect a JSON object")
+                return
+
+            try:
+                fire(name, structured)
+            except NotImplementedError:
+                logger.warn("Event generated by HTTP request without active session. Do you have a SessionManager configured?")
+                self.request.send_error(500, "No current context available.")
+                return
+
+            self.request.send_response(202)
+            self.request.send_header('content-type', 'text/plain; charset=utf-8')
+            self.request.send_header('content-length', 0)
+            self.request.end_headers()
+
+    return EventGenerationHandler
+
+
+class EventStream(sse.ServerSideEvents):
+    def go_subscribe(self):
+        def receiver(name, event):
+            self.send_event(event.data.get('json'), event.name, event.data.get('id'))
+
+        self.receiver = receiver
+        context = get_context()
+        context.channel.subscribe(self.receiver, 'emit')
+
+    def go_unsubscribe(self):
+        context = get_context()
+        context.channel.unsubscribe(self.receiver, 'emit')