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Summary of ChangesHello @xushiwei, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request refines the DQL (Declarative Query Language) system by enhancing error handling, updating query syntax for clarity and robustness, and making internal compiler adjustments. The changes aim to provide a more reliable and explicit querying experience, particularly with Highlights
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Code Review
This pull request introduces a new dql/fetcher feature, enabling data fetching and parsing from web pages using DQL, and adds several fetchers for sources like GitHub and PyTorch documentation. While it includes fixes and enhancements to the DQL implementation and XGo compiler, critical issues have been identified. The hrefs fetcher allows arbitrary URL fetching, posing a significant SSRF risk, and the autogenerated code uses unsafe type assertions like input.(string) which can lead to runtime panics and Denial of Service. Furthermore, the newly generated xgo_autogen.go files contain syntactically incorrect if statements that will cause compilation to fail. All these issues must be addressed in the source .xgo files or the code generator.
| if | ||
| //line dql/fetcher/github.com/issueTask/issueTask.xgo:39:1 | ||
| _xgo_val, _xgo_err := self.XGo_first(); _xgo_err == nil { |
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The generated if statement is syntactically incorrect due to the newline after the if keyword. This will cause a compilation error. This issue appears in all newly added xgo_autogen.go files in this pull request.
In Go, the if keyword and its condition (including any initialization statement) must be on the same line.
if _xgo_val, _xgo_err := self.XGo_first(); _xgo_err == nil {| func URL(input interface{}) string { | ||
| //line dql/fetcher/hrefs/hrefs.xgo:40:1 | ||
| return input.(string) | ||
| } |
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The hrefs fetcher is registered with a URL function that returns the input string directly without any validation, sanitization, or domain prefixing. This allows for arbitrary URL fetching, which is a classic Server-Side Request Forgery (SSRF) vulnerability if the fetcher.Do function is called with user-controlled input for this fetcher type. An attacker could use this to scan internal networks or access sensitive internal services (e.g., cloud metadata services). Additionally, the direct type assertion input.(string) will cause a runtime panic if the input is not a string, leading to a potential Denial of Service (DoS). It is recommended to implement a whitelist of allowed domains or restrict this fetcher to specific safe protocols and to use a type switch or comma-ok assertion for safer type handling.
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