Replace hand-rolled HTTP/HMAC/JSON code (~270 lines) with the official
line-bot-sdk-go v8, reducing maintenance burden and eliminating potential
bugs in signature verification, request construction, and response parsing.
This continues the work started in #500 by @xiaket, addressing all review
feedback and rebasing onto current main.
Changes:
- Replace bytes/crypto/json/io imports with line-bot-sdk-go/v8
- Use webhook.ParseRequest for body reading + signature verification
- Use messaging_api.MessagingApiAPI for ReplyMessage/PushMessage/ShowLoadingAnimation/GetBotInfo
- Type-switch on webhook.MessageEvent message types (TextMessageContent,
ImageMessageContent, etc.) instead of JSON unmarshalling
- Type-switch on webhook.SourceInterface (UserSource/GroupSource/RoomSource)
- Type-switch on webhook.Mentionee (UserMentionee/AllMentionee)
Review feedback addressed (from #500):
- Use WithContext(ctx) on all SDK calls to preserve cancellation/timeout
- Fix variable shadowing of isMentioned (declared at function scope)
- Remove reflect-based message ID extraction (use type switch + msg.Id)
- Use mentionee.IsSelf for cleaner bot mention detection
- Preserve body size security check via http.MaxBytesReader before
webhook.ParseRequest (compatible with #1413)
All existing tests pass without modification.
fe51cd504f