Add forward spam detection via quote text and external reply photo OCR#115
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Add forward spam detection via quote text and external reply photo OCR#115
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Szer
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Feb 27, 2026
Spam forwarded as "reply to external message" was bypassing ML because the bot only analyzed message.Text/Caption and message.Photo. Now we extract text from message.Quote and run OCR on message.ExternalReply.Photo, prepending the result before the original message text so the ML pipeline sees the full content. Feature-flagged via FORWARD_SPAM_DETECTION_ENABLED (default: true). Made-with: Cursor
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Pull request overview
This PR extends the bot’s spam-detection enrichment pipeline to include forwarded/quoted content by prepending message.Quote.Text and OCR text from message.ExternalReply.Photo to the message text, controlled by a new FORWARD_SPAM_DETECTION_ENABLED configuration flag.
Changes:
- Add
ForwardSpamDetectionEnabledtoBotConfigurationand wire it toFORWARD_SPAM_DETECTION_ENABLED(defaulttrue). - Add forwarded-content enrichment (quote text + external reply photo OCR) and refactor shared OCR logic into
ocrPhotos. - Extend test utilities and add ML tests covering quote and external reply OCR scenarios.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| src/VahterBanBot/Types.fs | Adds ForwardSpamDetectionEnabled to configuration. |
| src/VahterBanBot/Program.fs | Reads FORWARD_SPAM_DETECTION_ENABLED env var (default true). |
| src/VahterBanBot/Bot.fs | Adds forwarded-content enrichment + shared ocrPhotos; wires enrichment into onUpdate. |
| src/VahterBanBot.Tests/ContainerTestBase.fs | Sets forward-spam env var appropriately for ML-enabled/disabled containers. |
| src/VahterBanBot.Tests/TgMessageUtils.fs | Adds helpers for TextQuote / ExternalReplyInfo; extends quickMsg. |
| src/VahterBanBot.Tests/MLBanTests.fs | Adds tests for spam/ham detection via quote text and external reply photo OCR. |
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…itored chats - ocrPhotos: handle case where all candidate photos have null FileSize by falling back to largest by dimensions instead of throwing on empty sequence. Extracted selectLargestPhoto to avoid FS3511 in task CE. - tryEnrichMessageWithForwardedContent and tryEnrichMessageWithOcr now skip processing for messages from chats not in ChatsToMonitor, avoiding unnecessary OCR network calls. Made-with: Cursor
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Summary
message.Quote.Textand running OCR onmessage.ExternalReply.Photo, prepending the content before the original message text so ML sees the full pictureFORWARD_SPAM_DETECTION_ENABLEDenv var (default:true)ocrPhotoshelper to deduplicate the photo-to-text pipeline between existing OCR enrichment and the new forward enrichmenttryEnrichMessageWithOcrandtryEnrichMessageWithForwardedContentnow skip messages from non-monitored chats, avoiding unnecessary OCR/network callsocrPhotosnow handles the case where all candidate photos have nullFileSizeby falling back to largest by dimensions instead of throwing on an empty sequenceChanges
ForwardSpamDetectionEnabledtoBotConfigurationFORWARD_SPAM_DETECTION_ENABLEDenv var (defaulttrue)tryEnrichMessageWithForwardedContent+ocrPhotos/selectLargestPhotohelpers, called inonUpdatebefore existing OCR enrichment; added monitored-chat guards to both enrichment functionstrue) and ML-disabled (false) test containersTg.textQuote,Tg.externalReplyhelpers; addedquote/externalReplyparams toTg.quickMsgTest plan