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PR Review: OAS API Versions Path Handling Fix

Overview

This PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. The issue was in the path handling logic for versioned APIs.

Technical Analysis

The change modifies how request paths are handled for non-base OAS API versions:

-v.Spec.SanitizeProxyPaths(r)
+new_listen_path := v.Spec.Proxy.ListenPath[:len(v.Spec.Proxy.ListenPath)-1] + "-" + targetVersion
+r.URL.Path = new_listen_path + v.Spec.StripListenPath(r.URL.Path)

What the fix does:

1. Removes proxy path sanitization - The previous approach using SanitizeProxyPaths() wasn't correctly handling versioned paths for OAS APIs
2. Creates a version-specific listen path - Constructs a new path by appending the version identifier to the base path
3. Updates the request URL - Sets the URL path to use this new listen path plus the stripped original path

How this resolves the issue:

When a request is made to a non-base version of an OAS API, the handler now receives the correct path with proper version information, allowing it to correctly execute mock responses and other version-specific functionality.

Potential Concerns

1. Empty ListenPath handling: The code assumes v.Spec.Proxy.ListenPath has at least one character. If empty, this could cause a panic when slicing with [:len(v.Spec.Proxy.ListenPath)-1].

2. Path concatenation edge cases: There might be issues with path concatenation if the paths don't have the right slashes, potentially leading to malformed URLs.

Recommendation

The fix correctly addresses the issue with mock responses not executing for non-base OAS API versions. However, I recommend adding validation to prevent potential panics with empty paths and ensuring proper slash handling in path concatenation.

Tip: Mention me again using /connectivity <request>.
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Security Review: OAS API Versions Path Handling Fix

Overview

This PR fixes an issue where mock responses were not being executed when calling non-base versions of OAS API. The change modifies how request paths are handled for versioned APIs to ensure proper routing.

Key Changes

The PR makes a targeted change to gateway/mw_version_check.go:

• Removes v.Spec.SanitizeProxyPaths(r) call
• Adds code to construct a proper listen path with version suffix
• Sets the URL path correctly to ensure proper handler invocation

- v.Spec.SanitizeProxyPaths(r)
+ new_listen_path := v.Spec.Proxy.ListenPath[:len(v.Spec.Proxy.ListenPath)-1] + "-" + targetVersion
+ r.URL.Path = new_listen_path + v.Spec.StripListenPath(r.URL.Path)

Security Analysis

Potential Issues

1. Path Manipulation: The code assumes v.Spec.Proxy.ListenPath is non-empty and has at least one character. If it's empty, this could cause a panic due to the slice operation.

2. URL Path Construction: The concatenation of paths without proper slash handling could potentially lead to malformed URLs in some edge cases.

Mitigating Factors

• The code operates in a controlled environment where ListenPath is typically set
• The PR doesn't introduce new user input handling that could be exploited
• The change is focused on internal path handling rather than security boundaries

Recommendations

1. Add Empty Path Check: Consider adding validation to ensure v.Spec.Proxy.ListenPath is not empty before performing the substring operation.

2. Ensure Proper Path Joining: Consider normalizing slash handling when joining paths to prevent potential path issues.

Conclusion

This PR appears to be a functional fix with minimal security implications. The changes are focused on ensuring correct internal routing for versioned APIs, particularly for mock responses. The potential issues identified are edge cases rather than security vulnerabilities.

While there are some minor improvements that could be made for robustness, the PR as implemented should resolve the reported issue without introducing significant security concerns.

Tip: Mention me again using /security <request>.
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Dependency Impact Analysis: OAS API Versions Mock Response Fix

Issue Overview

The PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. This was happening because the path handling for versioned APIs was incorrect, preventing the proper invocation of mock response handlers.

Code Changes Analysis

The fix makes two critical changes to the ProcessRequest method in mw_version_check.go:

1. Removes incorrect path sanitization:

   // Old code
   v.Spec.SanitizeProxyPaths(r)

   This method was incorrectly modifying the request path for versioned APIs, causing mock response handlers to not be triggered.

2. Adds proper versioned path construction:

   // New code
   new_listen_path := v.Spec.Proxy.ListenPath[:len(v.Spec.Proxy.ListenPath)-1] + "-" + targetVersion
   r.URL.Path = new_listen_path + v.Spec.StripListenPath(r.URL.Path)

   This creates a properly formatted path that includes the version suffix, ensuring the correct handler is invoked.

Dependency Impact

Direct Dependencies

• StripListenPath: The fix now relies on this method to correctly strip the listen path from the request URL path.
• Handler Invocation: The change affects how internal API handlers are invoked for versioned endpoints.

Potential Risks

1. Empty ListenPath: The code assumes v.Spec.Proxy.ListenPath has at least one character, which could cause a runtime panic if empty.
2. Path Concatenation: There's no explicit handling to ensure proper slash placement when joining paths, which could potentially lead to malformed URLs in edge cases.

Affected Functionality

• Mock Response Execution: This fix directly impacts the execution of mock responses for non-base OAS API versions.
• Path Routing: Changes how request paths are constructed and routed for versioned APIs.

Conclusion

The change is focused and addresses the specific issue of mock responses not executing for non-base OAS API versions. The implementation correctly modifies the request path to include the version suffix and uses the appropriate internal handler.

While there are some potential edge cases around empty paths and slash handling, the fix is generally sound and should resolve the reported issue without introducing significant new risks. The PR successfully ensures that mock responses work consistently across all API versions.

Tip: Mention me again using /dependency <request>.
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Tyk Gateway Dependency Impact Reviewer

PR Review: Fix for Mock Response Execution in Non-Base OAS API Versions

Issue Summary

The PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. This occurred because the path handling for versioned APIs was not correctly managing the listen path, which prevented the proper handler from being invoked for mock responses.

Root Cause Analysis

When a request is made to a non-base version of an OAS API, the VersionCheck middleware is responsible for routing the request to the correct API version handler. The issue was in the path handling logic:

1. Previously, the code used v.Spec.SanitizeProxyPaths(r) which would strip the listen path from the URL but didn't properly account for the version suffix in the path.

2. This caused the request to be forwarded to the handler with an incorrect path, resulting in mock responses not being executed for non-base API versions.

Solution Implemented

The PR replaces the previous path handling with a more explicit approach:

// Old code
v.Spec.SanitizeProxyPaths(r)
// New code
new_listen_path := v.Spec.Proxy.ListenPath[:len(v.Spec.Proxy.ListenPath)-1] + "-" + targetVersion
r.URL.Path = new_listen_path + v.Spec.StripListenPath(r.URL.Path)

This change:

1. Creates a new listen path by appending the version suffix to the base listen path
2. Strips the original listen path from the URL
3. Prepends the new versioned listen path to the stripped URL path

This ensures that the request is forwarded to the correct handler with the proper path structure, allowing mock responses to be correctly executed for non-base API versions.

Technical Assessment

Strengths

• The fix is minimal and focused on the specific issue
• It maintains the existing API behavior while fixing the bug
• The solution aligns with the existing architecture of path handling in Tyk

Potential Concerns

1. Edge Case Handling: The code assumes that v.Spec.Proxy.ListenPath is not empty and ends with a slash. If either condition is not met, it could lead to runtime errors.

2. Path Concatenation: The solution directly concatenates paths without ensuring proper slash handling, which could potentially lead to malformed URLs in some edge cases.

Testing Considerations

The PR should be tested with:

1. OAS APIs with multiple versions
2. Mock responses configured on non-base versions
3. Various path configurations to ensure robustness
4. Edge cases like empty listen paths or paths without trailing slashes

Conclusion

This PR effectively fixes the issue with mock responses not executing for non-base OAS API versions by correctly handling the path transformation for versioned APIs. The implementation is straightforward and aligns with the existing codebase architecture, though some additional validation could be added to handle edge cases more robustly.

Tip: Mention me again using /performance <request>.
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Analysis of PR #7254: OAS API Versions Path Handling Fix

Issue Overview

This PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. The issue was in the path handling logic for versioned APIs, which prevented the correct operation from being found in the OAS definition.

Technical Analysis

Root Cause

When a request is made to a non-base version of an OAS API, the VersionCheck middleware is responsible for routing the request to the correct API version handler. The issue was that for OAS APIs, the code was using v.Spec.SanitizeProxyPaths(r) which wasn't correctly handling the versioned paths, causing the findOperation method to fail to find the correct operation in the OAS definition.

Solution

The PR modifies the path handling logic for versioned OAS APIs:

// Before
v.Spec.SanitizeProxyPaths(r)
// After
target_api := v.Gw.apisByID[subVersionID]
stripped_path := v.Spec.StripListenPath(r.URL.Path)
new_path, err := url.JoinPath(target_api.Proxy.ListenPath, stripped_path)
if err != nil {
 log.Errorf("Url Join Error, err: %s", err)
 return errors.New(http.StatusText(http.StatusInternalServerError)), http.StatusInternalServerError
}
r.URL.Path = new_path

This change ensures that:

1. The listen path is correctly stripped from the original URL
2. The target API's listen path is properly joined with the stripped path
3. The request URL is updated with the new path

By fixing the path handling, the findOperation method can now correctly find the operation in the OAS definition, allowing mock responses to be executed for non-base versions of OAS APIs.

Impact on Downstream Repositories

This PR has no impact on downstream repositories:

1. tyk-operator: No changes to API definition schemas or OAS structures
2. tyk-charts: No configuration changes or environment variable modifications
3. portal: No changes to how API definitions are stored or retrieved
4. tyk-sink (MDCB): No modifications to RPC protocols or data synchronization

Potential Concerns

1. Empty Path Handling: The PR doesn't explicitly check if target_api.Proxy.ListenPath is empty before using it in url.JoinPath(). However, this is handled by the url.JoinPath() function which can handle empty paths.

2. Path Concatenation: The PR uses url.JoinPath() which properly handles slash concatenation, addressing potential issues with malformed URLs.

Conclusion

This PR is a focused bug fix that addresses a specific issue with path handling for versioned OAS APIs. It ensures that mock responses work correctly for non-base versions of OAS APIs without affecting external interfaces or downstream repositories. The implementation is straightforward and uses standard Go libraries for path handling, making it a safe and effective solution.

Tip: Mention me again using /dependency <request>.
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Tyk Gateway Dependency Impact Reviewer

Analysis of PR #7254: OAS API Versions Path Handling Fix

This PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. The issue was in the path handling logic for versioned APIs.

Core Changes

The main fix is in gateway/mw_version_check.go where the code now handles path routing differently for OAS API versions:

// Before
v.Spec.SanitizeProxyPaths(r)
// After
if v.Spec.IsOAS {
 target_api := v.Gw.apisByID[subVersionID]
 stripped_path := v.Spec.StripListenPath(r.URL.Path)
 new_path, err := url.JoinPath(target_api.Proxy.ListenPath, stripped_path)
 if err != nil {
 log.Errorf("Url Join Error, err: %s", err)
 return errors.New(http.StatusText(http.StatusInternalServerError)), http.StatusInternalServerError
 }
 r.URL.Path = new_path
} else {
 v.Spec.SanitizeProxyPaths(r)
}

How This Fixes the Issue

The problem was that for non-base versions of OAS APIs, the request path wasn't being properly constructed to include the version information. This caused the mock response handlers to not be triggered correctly.

The fix:

1. Identifies when we're dealing with an OAS API
2. Gets the target API using the version ID
3. Strips the listen path from the request URL
4. Joins the target API's listen path with the stripped path
5. Sets the new path on the request

This ensures that the request is properly routed to the correct handler for the versioned API, allowing mock responses to be executed correctly.

Potential Concerns

1. The code assumes v.Spec.Proxy.ListenPath is not empty. If it's empty, this could potentially cause issues.
2. Path concatenation could have edge cases with slash handling, though the use of url.JoinPath should mitigate most of these.

Overall, this is a focused fix that addresses the specific issue without introducing significant new complexity.

Tip: Mention me again using /performance <request>.
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Analysis of OAS API Versions Mock Response Fix

Issue Summary

The PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. This occurred because the path handling for versioned APIs wasn't correctly managing the listen path, which prevented the proper handler from being invoked for mock responses.

Root Cause

When a request is made to a non-base version of an OAS API, the VersionCheck middleware is responsible for routing the request to the correct API version handler. The issue was in the path handling logic:

1. Previously, the code used v.Spec.SanitizeProxyPaths(r) for all APIs, which didn't properly account for OAS APIs with version suffixes in the path.

2. This caused the request to be forwarded with an incorrect path structure, preventing the findOperation() method from matching the request to the appropriate OAS operation, resulting in mock responses not being executed.

Solution

The PR implements a conditional approach to path handling based on API type:

if v.Spec.IsOAS {
 target_api := v.Gw.apisByID[subVersionID]
 stripped_path := v.Spec.StripListenPath(r.URL.Path)
 new_path, err := url.JoinPath(target_api.Proxy.ListenPath, stripped_path)
 if err != nil {
 log.Errorf("Url Join Error, err: %s", err)
 return errors.New(http.StatusText(http.StatusInternalServerError)), http.StatusInternalServerError
 }
 r.URL.Path = new_path
} else {
 v.Spec.SanitizeProxyPaths(r)
}

This change:

1. For OAS APIs, it properly constructs the path by:

   • Getting the target API definition
   • Stripping the listen path from the request URL
   • Joining the target API's listen path with the stripped path
   • Setting the request URL path to this new path

2. For non-OAS APIs, it continues to use the existing SanitizeProxyPaths method.

Technical Impact

The fix ensures that when a request is made to a non-base version of an OAS API:

1. The path is correctly constructed to include the version information
2. The findOperation() method can properly match the request to the corresponding OAS operation
3. The mock response middleware can correctly identify and execute the appropriate mock response

This is a targeted fix that addresses a specific issue without introducing new functionality or changing existing behavior. It simply ensures that the existing functionality works correctly for all API versions.

Tip: Mention me again using /security <request>.
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Understanding the OAS API Versioning Fix

The Issue

The PR addresses a bug where mock responses weren't being executed when calling non-base versions of OAS APIs. This occurred because of how path handling was implemented for versioned APIs in the VersionCheck middleware.

Root Cause Analysis

When a request is made to a non-base version of an OAS API, the following sequence occurs:

1. The VersionCheck middleware identifies that the request is for a non-base version
2. It finds the appropriate handler for that version
3. It modifies the request path before passing it to the handler
4. The mockResponseMiddleware tries to find the appropriate operation to serve a mock response

The issue was in step 3. Previously, all APIs (both classic and OAS) used v.Spec.SanitizeProxyPaths(r) to modify the request path. For OAS APIs, this approach didn't correctly handle the path for versioned APIs, causing the findOperation() method to fail to match the request to the correct operation.

Looking at the mockResponse method:

func (m *mockResponseMiddleware) mockResponse(r *http.Request) (*http.Response, error) {
 // if response is nil we go further
 operation := m.Spec.findOperation(r)
 
 if operation == nil {
 return nil, nil
 }
 
 mockResponse := operation.MockResponse
 if mockResponse == nil || !mockResponse.Enabled {
 return nil, nil
 }
 
 // ... serve mock response
}

The key issue is that findOperation() was returning nil because the path handling for versioned OAS APIs was incorrect, preventing the mock response from being served.

The Fix

The PR modifies the VersionCheck middleware to handle path construction differently for OAS APIs:

if v.Spec.IsOAS {
 target_api := v.Gw.apisByID[subVersionID]
 stripped_path := v.Spec.StripListenPath(r.URL.Path)
 new_path, err := url.JoinPath(target_api.Proxy.ListenPath, stripped_path)
 if err != nil {
 log.Errorf("Url Join Error, err: %s", err)
 return errors.New(http.StatusText(http.StatusInternalServerError)), http.StatusInternalServerError
 }
 r.URL.Path = new_path
} else {
 v.Spec.SanitizeProxyPaths(r)
}

This change:

1. For OAS APIs:
   • Gets the target API using the version ID
   • Strips the listen path from the original request URL
   • Joins the target API's listen path with the stripped path
   • Updates the request URL path with this new path
2. For classic APIs, continues to use the existing SanitizeProxyPaths method

Why This Fixes the Issue

The fix works because:

1. It ensures the request path is correctly formatted for the target API version
2. This allows the findOperation() method to correctly match the request to the appropriate operation in the OAS definition
3. When the operation is correctly identified, the mockResponseMiddleware can find and use the mock response configuration

The key insight is that OAS APIs need special path handling for versioned endpoints to ensure the correct operation is found, which is essential for features like mock responses to work properly.

Technical Details

The findOperation method in model_apispec.go is critical to this process:

func (a *APISpec) findOperation(r *http.Request) *Operation {
 middleware := a.OAS.GetTykMiddleware()
 if middleware == nil {
 return nil
 }
 if a.oasRouter == nil {
 log.Warningf("OAS router not initialized properly. Unable to find route for %s %v", r.Method, r.URL)
 return nil
 }
 rClone := *r
 rClone.URL = ctxGetInternalRedirectTarget(r)
 route, pathParams, err := a.oasRouter.FindRoute(&rClone)
 
 if err != nil {
 // Log and return nil
 return nil
 }
 operation, ok := middleware.Operations[route.Operation.OperationID]
 if !ok {
 log.Warningf("No operation found for ID: %s", route.Operation.OperationID)
 return nil
 }
 return &Operation{
 Operation: operation,
 route: route,
 pathParams: pathParams,
 }
}

With the corrected path handling, this function can now successfully find the operation for versioned APIs, allowing mock responses to be executed correctly.

Tip: Mention me again using /connectivity <request>.
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Analysis of PR #7254: OAS API Versions Path Handling Fix

Issue Overview

This PR addresses a bug (TT-15301) where mock responses were not being executed when calling non-base versions of OAS APIs. The issue was in the path handling logic for versioned APIs, which prevented the correct operation from being found in the OAS definition.

Root Cause Analysis

When a request is made to a non-base version of an OAS API, the VersionCheck middleware is responsible for routing the request to the correct API version handler. The issue was in the path handling logic:

Previously, the code was using a simplistic approach to construct the versioned path:

new_listen_path := v.Spec.Proxy.ListenPath[:len(v.Spec.Proxy.ListenPath)-1] + "-" + targetVersion
r.URL.Path = new_listen_path + v.Spec.StripListenPath(r.URL.Path)

This approach didn't correctly handle the path for OAS APIs with version suffixes, causing the findOperation() method to fail to match the request to the appropriate operation in the OAS definition, resulting in mock responses not being executed.

Solution Implementation

The PR implements a more robust approach to path handling for OAS APIs:

if v.Spec.IsOAS {
 target_api := v.Gw.apisByID[subVersionID]
 stripped_path := v.Spec.StripListenPath(r.URL.Path)
 new_path, err := url.JoinPath(target_api.Proxy.ListenPath, stripped_path)
 if err != nil {
 log.Errorf("Url Join Error, err: %s", err)
 return errors.New(http.StatusText(http.StatusInternalServerError)), http.StatusInternalServerError
 }
 r.URL.Path = new_path
} else {
 v.Spec.SanitizeProxyPaths(r)
}

This change:

1. Differentiates between OAS and non-OAS APIs
2. For OAS APIs:
   • Gets the target API definition using the version ID
   • Strips the listen path from the request URL
   • Properly joins the target API's listen path with the stripped path using url.JoinPath()
   • Updates the request URL path with this new path
3. For non-OAS APIs, continues to use the existing SanitizeProxyPaths method

Benefits of the Fix

1. Ensures that mock responses work correctly for all versions of OAS APIs
2. Uses the standard url.JoinPath() function which properly handles path joining with correct slash handling
3. Provides better error handling for path construction failures
4. Maintains backward compatibility with non-OAS APIs

The fix is minimal and focused on the specific issue without introducing new functionality or changing existing behavior. It simply ensures that the existing functionality works correctly for all API versions.

Tip: Mention me again using /dependency <request>.
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Tyk Gateway Dependency Impact Reviewer

Understanding the OAS API Versioning Mock Response Fix

The Issue

The PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. This occurred because of how path handling was implemented in the VersionCheck middleware for versioned APIs.

Root Cause Analysis

When a request is made to a non-base version of an OAS API, the following sequence occurs:

1. The VersionCheck middleware identifies that the request is for a non-base version
2. It finds the appropriate handler for that version using subVersionID
3. It modifies the request path before passing it to the handler
4. The mockResponseMiddleware tries to find the appropriate operation to serve a mock response

The issue was in step 3. Before the fix, the code was using a generic approach for all API types:

new_listen_path := v.Spec.Proxy.ListenPath[:len(v.Spec.Proxy.ListenPath)-1] + "-" + targetVersion
r.URL.Path = new_listen_path + v.Spec.StripListenPath(r.URL.Path)

This approach didn't work correctly for OAS APIs because:

1. It constructed a path that didn't match the expected format for the OAS router
2. When the findOperation method was called in the mock response middleware, it couldn't find the correct operation because the path didn't match any route in the OAS definition
3. As a result, no mock response was served for non-base versions of OAS APIs

The Fix

The PR introduces a conditional path handling approach based on whether the API is an OAS API or not:

if v.Spec.IsOAS {
 target_api := v.Gw.apisByID[subVersionID]
 stripped_path := v.Spec.StripListenPath(r.URL.Path)
 new_path, err := url.JoinPath(target_api.Proxy.ListenPath, stripped_path)
 if err != nil {
 log.Errorf("Url Join Error, err: %s", err)
 return errors.New(http.StatusText(http.StatusInternalServerError)), http.StatusInternalServerError
 }
 r.URL.Path = new_path
} else {
 v.Spec.SanitizeProxyPaths(r)
}

This fix:

1. For OAS APIs:

   • Gets the target API definition using the version ID
   • Strips the listen path from the original request URL
   • Properly joins the target API's listen path with the stripped path using url.JoinPath
   • Updates the request URL path with this new path

2. For non-OAS APIs:

   • Continues to use the existing SanitizeProxyPaths method

The key improvement is that for OAS APIs, the path is now constructed in a way that the OAS router can correctly match it to an operation in the OAS definition. This allows the findOperation method in the mock response middleware to find the correct operation and serve the mock response.

Why This Works

The fix works because:

1. It ensures the request path is correctly formatted for the target API version
2. This allows the findOperation method to correctly match the request to the appropriate operation in the OAS definition
3. When the operation is correctly identified, the mockResponseMiddleware can find and use the mock response configuration

The use of url.JoinPath also ensures proper path joining with correct handling of slashes, which prevents potential issues with malformed URLs.

Technical Impact

This change only affects the internal path handling for versioned OAS APIs and doesn't modify any external interfaces or behaviors. It's a targeted fix that ensures existing functionality (mock responses) works correctly for all API versions.

Tip: Mention me again using /connectivity <request>.
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Persistent review updated to latest commit 848b2db

Analysis of PR #7254: OAS API Versions Path Handling Fix

Issue Overview

This PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. The issue was in the path handling logic in the VersionCheck middleware, which didn't correctly construct the path for versioned OAS APIs.

Root Cause Analysis

When a request is made to a non-base version of an API, the VersionCheck middleware is responsible for routing the request to the correct API version handler. For OAS APIs, the mock response functionality relies on the findOperation method to match the request path to an operation in the OAS definition.

The problem was that the middleware was using the same path handling logic for both OAS and non-OAS APIs:

v.Spec.SanitizeProxyPaths(r)

This approach worked fine for classic APIs but didn't correctly handle the path for OAS APIs with version suffixes, causing the findOperation method to fail to find the correct operation, which resulted in mock responses not being executed.

The Fix

The PR adds a conditional check to handle OAS APIs differently:

if v.Spec.IsOAS {
 targetApi, ok := v.Gw.apisByID[subVersionID]
 if !ok {
 return errors.New(string(VersionDoesNotExist)), http.StatusNotFound
 }
 strippedPath := v.Spec.StripListenPath(r.URL.Path)
 newPath, err := url.JoinPath(targetApi.Proxy.ListenPath, strippedPath)
 if err != nil {
 return err, http.StatusInternalServerError
 }
 r.URL.Path = newPath
} else {
 v.Spec.SanitizeProxyPaths(r)
}

This change:

1. For OAS APIs:
   • Gets the target API definition using the version ID
   • Strips the listen path from the request URL
   • Properly joins the target API's listen path with the stripped path using url.JoinPath()
   • Updates the request URL path with this new path
2. For non-OAS APIs, continues to use the existing SanitizeProxyPaths method

Why This Fixes the Issue

The fix works because:

1. It ensures the request path is correctly formatted for the target API version
2. This allows the findOperation method to correctly match the request to the appropriate operation in the OAS definition
3. When the operation is correctly identified, the mock response middleware can find and use the mock response configuration

The use of url.JoinPath() is particularly important as it properly handles path joining with correct slash handling, preventing potential issues with malformed URLs.

Technical Impact

This change only affects the internal path handling for versioned OAS APIs and doesn't modify any external interfaces or behaviors. It's a targeted fix that ensures existing functionality (mock responses) works correctly for all API versions.

The implementation is robust, handling error cases and maintaining backward compatibility with non-OAS APIs.

Tip: Mention me again using /connectivity <request>.
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Analysis of OAS API Versioning Path Handling Fix

Issue Summary

This PR addresses a bug where mock responses weren't being executed when calling non-base versions of OAS APIs. The issue was in the path handling logic in the VersionCheck middleware.

Root Cause Analysis

The problem occurred in the ProcessRequest method of the VersionCheck middleware. When handling a non-base version of an API, it was using v.Spec.SanitizeProxyPaths(r) to modify the request path. This approach works fine for classic APIs but fails for OAS APIs because:

1. The OAS router relies on properly formatted paths to find operations
2. SanitizeProxyPaths doesn't correctly handle the path for versioned OAS APIs
3. As a result, findOperation() couldn't match the request to the correct operation, causing mock responses to not be executed

Solution Implementation

The PR introduces a conditional approach to path handling based on API type:

if v.Spec.IsOAS {
 targetApi, ok := v.Gw.apisByID[subVersionID]
 if !ok {
 return errors.New(string(VersionDoesNotExist)), http.StatusNotFound
 }
 
 strippedPath := v.Spec.StripListenPath(r.URL.Path)
 newPath, err := url.JoinPath(targetApi.Proxy.ListenPath, strippedPath)
 if err != nil {
 return err, http.StatusInternalServerError
 }
 r.URL.Path = newPath
} else {
 v.Spec.SanitizeProxyPaths(r)
}

This solution:

1. For OAS APIs:

   • Gets the target API definition using the version ID
   • Strips the listen path from the request URL
   • Properly joins the target API's listen path with the stripped path using url.JoinPath()
   • Sets the request URL path to this new path

2. For non-OAS APIs:

   • Continues to use the existing SanitizeProxyPaths method

Technical Impact

The fix ensures that when a request is made to a non-base version of an OAS API:

1. The path is correctly constructed in a format that the OAS router can understand
2. The findOperation() method can properly match the request to the corresponding operation
3. The mock response middleware can correctly identify and execute the appropriate mock response

The use of url.JoinPath() is a good choice as it properly handles path joining with correct slash handling, preventing potential issues with malformed URLs that could occur with simple string concatenation.

Conclusion

This is a focused fix that addresses a specific issue with path handling for versioned OAS APIs. The implementation is straightforward and uses standard Go libraries for path handling, making it a safe and effective solution. The change only affects internal path handling and doesn't modify any external interfaces or behaviors, ensuring backward compatibility.

Tip: Mention me again using /connectivity <request>.
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Connectivity Issues Reviewer Prompt for Tyk Gateway

Analysis of PR #7254: OAS API Versions Path Handling Fix

Issue Overview

This PR addresses a bug where mock responses were not being executed when calling non-base versions of OAS APIs. The issue was in the path handling logic in the VersionCheck middleware.

Root Cause Analysis

When a request is made to a non-base version of an OAS API:

1. The VersionCheck middleware identifies the version and finds the appropriate handler
2. Previously, it used v.Spec.SanitizeProxyPaths(r) to modify the request path for all APIs
3. For OAS APIs, this approach didn't correctly construct the path, causing the FindOperation() method to fail to match the request to the appropriate operation
4. As a result, mock responses weren't being executed for non-base versions of OAS APIs

The issue occurs because the OAS router needs a properly formatted path to find the correct operation. The mockResponseMiddleware calls m.Spec.findOperation(r), which in turn calls a.OAS.FindOperation(r) for OAS APIs. This method uses the router to find the operation based on the request URL path. If the path is incorrectly formatted, the router can't find the operation, and the mock response isn't executed.

Solution Implementation

The PR modifies the ProcessRequest method in the VersionCheck middleware to handle path construction differently for OAS vs. non-OAS APIs:

if v.Spec.IsOAS {
 targetApi, ok := v.Gw.apisByID[subVersionID]
 if !ok {
 return errors.New(string(VersionDoesNotExist)), http.StatusNotFound
 }
 
 strippedPath := v.Spec.StripListenPath(r.URL.Path)
 newPath, err := url.JoinPath(targetApi.Proxy.ListenPath, strippedPath)
 if err != nil {
 return err, http.StatusInternalServerError
 }
 r.URL.Path = newPath
} else {
 v.Spec.SanitizeProxyPaths(r)
}

This change:

1. For OAS APIs, it gets the target API definition, strips the listen path from the request URL, and joins it with the target API's listen path using url.JoinPath()
2. For non-OAS APIs, it continues to use the existing SanitizeProxyPaths method

By correctly formatting the path for OAS APIs, the router can now find the appropriate operation, allowing the mock response middleware to work correctly for non-base versions of OAS APIs.

Technical Impact

This change is focused solely on internal path handling and doesn't affect any external interfaces or behaviors. It doesn't require changes to any downstream repositories (tyk-operator, tyk-charts, portal, tyk-sink) as it doesn't modify any API schemas, protocols, or configurations.

The fix ensures that all OAS API features, particularly mock responses, work correctly for all API versions, improving the consistency and reliability of the API gateway.

Tip: Mention me again using /dependency <request>.
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Tyk Gateway Dependency Impact Reviewer

Quality Gate Failed Quality Gate failed

Failed conditions
20.0% Coverage on New Code (required ≥ 80%)
C Reliability Rating on New Code (required ≥ A)

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