authentication_flow_diagram.svg•27 kB
<?xml version="1.0" encoding="us-ascii" standalone="no"?><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" contentStyleType="text/css" height="1387px" preserveAspectRatio="none" style="width:1397px;height:1387px;background:#FFFFFF;" version="1.1" viewBox="0 0 1397 1387" width="1397px" zoomAndPan="magnify"><defs/><g><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacing" textLength="309" x="540.25" y="27.9951">Google Chat MCP - Authentication Flow</text><rect fill="#FFFFFF" height="417.6641" style="stroke:#181818;stroke-width:1.0;" width="10" x="34" y="293.2578"/><rect fill="#FFFFFF" height="518.0625" style="stroke:#181818;stroke-width:1.0;" width="10" x="330" y="192.8594"/><rect fill="#FFFFFF" height="322.4609" style="stroke:#181818;stroke-width:1.0;" width="10" x="567" y="870.8516"/><rect fill="#FFFFFF" height="205.9297" style="stroke:#181818;stroke-width:1.0;" width="10" x="796" y="899.9844"/><rect 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height="417.6641" style="stroke:#181818;stroke-width:1.0;" width="10" x="34" y="293.2578"/><rect fill="#FFFFFF" height="518.0625" style="stroke:#181818;stroke-width:1.0;" width="10" x="330" y="192.8594"/><rect fill="#FFFFFF" height="322.4609" style="stroke:#181818;stroke-width:1.0;" width="10" x="567" y="870.8516"/><rect fill="#FFFFFF" height="205.9297" style="stroke:#181818;stroke-width:1.0;" width="10" x="796" y="899.9844"/><rect fill="#FFFFFF" height="102.5313" style="stroke:#181818;stroke-width:1.0;" width="10" x="1096" y="432.9219"/><rect fill="#FFFFFF" height="29.1328" style="stroke:#181818;stroke-width:1.0;" width="10" x="1096" y="564.5859"/><rect fill="#FFFFFF" height="29.1328" style="stroke:#181818;stroke-width:1.0;" width="10" x="1096" y="1011.5156"/><rect fill="#FFFFFF" height="29.1328" style="stroke:#181818;stroke-width:1.0;" width="10" x="1096" y="1135.0469"/><rect fill="#EEEEEE" height="3" style="stroke:#EEEEEE;stroke-width:1.0;" width="1390.5" x="0" y="149.1602"/><line style="stroke:#000000;stroke-width:1.0;" x1="0" x2="1390.5" y1="149.1602" y2="149.1602"/><line style="stroke:#000000;stroke-width:1.0;" x1="0" x2="1390.5" y1="152.1602" y2="152.1602"/><rect fill="#EEEEEE" height="23.1328" style="stroke:#000000;stroke-width:2.0;" width="157" x="616.75" y="138.5938"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="138" x="622.75" y="154.6606">Initial OAuth Setup</text><polygon fill="#181818" points="318,188.8594,328,192.8594,318,196.8594,322,192.8594" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="39" x2="324" y1="192.8594" y2="192.8594"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="217" x="46" y="187.7935">Run "python server.py -local-auth"</text><line style="stroke:#181818;stroke-width:1.5;" x1="340" x2="382" y1="221.9922" y2="221.9922"/><line style="stroke:#181818;stroke-width:1.5;" x1="382" x2="382" y1="221.9922" y2="234.9922"/><line style="stroke:#181818;stroke-width:1.5;" x1="341" x2="382" y1="234.9922" y2="234.9922"/><polygon fill="#181818" points="351,230.9922,341,234.9922,351,238.9922,347,234.9922" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="213" x="347" y="216.9263">Start FastAPI server on port 8000</text><polygon fill="#181818" points="50,260.125,40,264.125,50,268.125,46,264.125" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="44" x2="329" y1="264.125" y2="264.125"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="267" x="56" y="259.0591">Server ready at http://localhost:8000/auth</text><polygon fill="#181818" points="318,289.2578,328,293.2578,318,297.2578,322,293.2578" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="44" x2="324" y1="293.2578" y2="293.2578"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="142" x="51" y="288.1919">Access /auth endpoint</text><line style="stroke:#181818;stroke-width:1.5;" x1="340" x2="382" y1="322.3906" y2="322.3906"/><line style="stroke:#181818;stroke-width:1.5;" x1="382" x2="382" y1="322.3906" y2="335.3906"/><line style="stroke:#181818;stroke-width:1.5;" x1="341" x2="382" y1="335.3906" y2="335.3906"/><polygon fill="#181818" points="351,331.3906,341,335.3906,351,339.3906,347,335.3906" style="stroke:#181818;stroke-width:1.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="153" x="347" y="317.3247">Check for existing token</text><polygon fill="#181818" points="1212,360.5234,1222,364.5234,1212,368.5234,1216,364.5234" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="340" x2="1218" y1="364.5234" y2="364.5234"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="144" x="347" y="359.4575">Read client credentials</text><path d="M10,379.5234 L74,379.5234 L74,386.6563 L64,396.6563 L10,396.6563 L10,379.5234 " fill="#EEEEEE" style="stroke:#000000;stroke-width:1.5;"/><rect fill="none" height="324.3984" style="stroke:#000000;stroke-width:1.5;" width="1370.5" x="10" y="379.5234"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacing" textLength="19" x="25" y="392.5903">alt</text><text fill="#000000" font-family="sans-serif" font-size="11" font-weight="bold" lengthAdjust="spacing" textLength="228" x="89" y="391.7339">[No token exists or token is invalid]</text><polygon fill="#181818" points="1084,428.9219,1094,432.9219,1084,436.9219,1088,432.9219" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="340" x2="1090" y1="432.9219" y2="432.9219"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="212" x="347" y="412.7231">OAuth request with offline access</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="255" x="347" y="427.856">(access_type=offline, prompt=consent)</text><polygon fill="#181818" points="55,458.0547,45,462.0547,55,466.0547,51,462.0547" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="49" x2="1095" y1="462.0547" y2="462.0547"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="220" x="61" y="456.9888">Redirect to Google consent screen</text><polygon fill="#181818" points="1084,502.3203,1094,506.3203,1084,510.3203,1088,506.3203" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="44" x2="1090" y1="506.3203" y2="506.3203"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="256" x="51" y="486.1216">Grant permissions for requested scopes</text><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="139" x="51" y="501.2544">(Chat API, People API)</text><polygon fill="#181818" points="351,531.4531,341,535.4531,351,539.4531,347,535.4531" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="345" x2="1100" y1="535.4531" y2="535.4531"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="258" x="357" y="530.3872">Redirect to /auth/callback with auth code</text><polygon fill="#181818" points="1084,560.5859,1094,564.5859,1084,568.5859,1088,564.5859" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="340" x2="1090" y1="564.5859" y2="564.5859"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="339" x="347" y="559.52">Exchange code for tokens with refresh_token request</text><polygon fill="#181818" points="351,589.7188,341,593.7188,351,597.7188,347,593.7188" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="345" x2="1100" y1="593.7188" y2="593.7188"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="297" x="357" y="588.6528">Return access_token + refresh_token + expiry</text><polygon fill="#181818" points="1319,618.8516,1329,622.8516,1319,626.8516,1323,622.8516" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="340" x2="1325" y1="622.8516" y2="622.8516"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="166" x="347" y="617.7856">Save tokens to token.json</text><polygon fill="#181818" points="55,647.9844,45,651.9844,55,655.9844,51,651.9844" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="49" x2="329" y1="651.9844" y2="651.9844"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="163" x="61" y="646.9185">Authentication successful</text><line style="stroke:#000000;stroke-width:1.0;stroke-dasharray:2.0,2.0;" x1="10" x2="1380.5" y1="660.9844" y2="660.9844"/><text fill="#000000" font-family="sans-serif" font-size="11" font-weight="bold" lengthAdjust="spacing" textLength="169" x="15" y="671.1948">[Token exists and is valid]</text><polygon fill="#181818" points="55,691.9219,45,695.9219,55,699.9219,51,695.9219" style="stroke:#181818;stroke-width:1.0;"/><line style="stroke:#181818;stroke-width:1.5;" x1="49" x2="329" y1="695.9219" y2="695.9219"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacing" textLength="141" x="61" y="690.856">Already authenticated</text><path d="M340,715.9219 L340,800.9219 L686,800.9219 L686,725.9219 L676,715.9219 L340,715.9219 " fill="#FFFFEE" style="stroke:#999999;stroke-width:0.5;"/><path 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