SimpleChatTC:SimpleProxy: Switch to html.parser

As html can be malformed, xml ElementTree XMLParser cant handle
the same properly, so switch to the HtmlParser helper class that is
provided by python and try extend it.

Currently a minimal skeleton to just start it out, which captures
only the body contents.

tools/server/public_simplechat/local.tools/simpleproxy.py

@@ -12,7 +12,7 @@ import http.server
 import urllib.parse
 import urllib.request
 from dataclasses import dataclass
-import xml.etree.ElementTree as xmlET
+import html.parser
 
 
 gMe = {
@@ -83,6 +83,26 @@ def handle_urlraw(ph: ProxyHandler, pr: urllib.parse.ParseResult):
         ph.send_error(502, f"WARN:UrlFetchFailed:{exc}")
 
 
+class TextHtmlParser(html.parser.HTMLParser):
+
+    def __init__(self):
+        super().__init__()
+        self.bBody = False
+        self.text = ""
+
+    def handle_starttag(self, tag: str, attrs: list[tuple[str, str | None]]):
+        if tag == 'body':
+            self.bBody = True
+
+    def handle_endtag(self, tag: str):
+        if tag == 'body':
+            self.bBody = False
+
+    def handle_data(self, data: str):
+        if self.bBody:
+            self.text += f"{data}\n"
+
+
 def handle_urltext(ph: ProxyHandler, pr: urllib.parse.ParseResult):
     try:
         # Get requested url
@@ -91,16 +111,15 @@ def handle_urltext(ph: ProxyHandler, pr: urllib.parse.ParseResult):
             ph.send_error(got.httpStatus, got.httpStatusMsg)
             return
         # Extract Text
-        html = xmlET.fromstring(got.contentData)
-        for el in html.iter():
-            print(el)
+        textHtml = TextHtmlParser()
+        textHtml.feed(got.contentData)
         # Send back to client
         ph.send_response(got.httpStatus)
         ph.send_header('Content-Type', got.contentType)
         # Add CORS for browser fetch, just in case
         ph.send_header('Access-Control-Allow-Origin', '*')
         ph.end_headers()
-        ph.wfile.write(got.contentData.encode('utf-8'))
+        ph.wfile.write(textHtml.text.encode('utf-8'))
     except Exception as exc:
         ph.send_error(502, f"WARN:UrlFetchFailed:{exc}")