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Expose OSS static asset handling to unify OSS/EE serving (weaveworks#…
…4007) * Expose OSS static asset handling so we unify OSS/EE serving - Asset handling is growing more logic like injecting <base> tags - We should have the same code in OSS/EE * Implement CI suggestions --------- Co-authored-by: AlinaGoaga <[email protected]> Co-authored-by: AlinaGoaga <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package server | ||
|
|
||
| import ( | ||
| "io" | ||
| "io/fs" | ||
| "net/http" | ||
| "path/filepath" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| ) | ||
|
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| // AssetHandler returns a http.Handler that serves static assets from the provided fs.FS. | ||
| // It also redirects all non-file requests to index.html. | ||
| func AssetHandler(assetHandler, redirectHandler http.Handler) http.HandlerFunc { | ||
| return func(w http.ResponseWriter, req *http.Request) { | ||
| // Assume anything with a file extension in the name is a static asset. | ||
| extension := filepath.Ext(req.URL.Path) | ||
| // We use the golang http.FileServer for static file requests. | ||
| // This will return a 404 on normal page requests, ie /some-page. | ||
| // Redirect all non-file requests to index.html, where the JS routing will take over. | ||
| if extension == "" { | ||
| redirectHandler.ServeHTTP(w, req) | ||
| return | ||
| } | ||
| assetHandler.ServeHTTP(w, req) | ||
| } | ||
| } | ||
|
|
||
| // IndexHTMLHandler ensures that index.html always gets served. | ||
| // The JS router will take care of actual navigation once the index.html page lands. | ||
| func IndexHTMLHandler(fsys fs.FS, log logr.Logger, routePrefix string) http.HandlerFunc { | ||
| baseHref := GetBaseHref(routePrefix) | ||
| log.Info("Creating redirector", "routePrefix", routePrefix, "baseHref", baseHref) | ||
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| return func(w http.ResponseWriter, r *http.Request) { | ||
| indexPage, err := fsys.Open("index.html") | ||
| if err != nil { | ||
| log.Error(err, "could not open index.html page") | ||
| http.Error(w, "could not open index.html page", http.StatusInternalServerError) | ||
| return | ||
| } | ||
| defer indexPage.Close() | ||
|
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||
| bt, err := io.ReadAll(indexPage) | ||
| if err != nil { | ||
| log.Error(err, "could not read index.html") | ||
| http.Error(w, "could not read index.html", http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
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| // inject base tag into index.html | ||
| bt = InjectHTMLBaseTag(bt, baseHref) | ||
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| _, err = w.Write(bt) | ||
| if err != nil { | ||
| log.Error(err, "error writing index.html") | ||
| http.Error(w, "error writing index.html", http.StatusInternalServerError) | ||
| return | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| package server | ||
|
|
||
| import ( | ||
| "io" | ||
| "io/fs" | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "os" | ||
| "strings" | ||
| "testing" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| ) | ||
|
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||
| func TestCreateRedirector(t *testing.T) { | ||
| log := logr.Discard() | ||
| // Easiest way to create a filesystem.. | ||
| fsys, err := fs.Sub(os.DirFS("testdata"), "public") | ||
| if err != nil { | ||
| t.Fatalf("failed to create fs: %v", err) | ||
| } | ||
|
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| t.Run("We read the index.html and inject base", func(t *testing.T) { | ||
| req := httptest.NewRequest("GET", "https://example.com/foo", nil) | ||
| w := httptest.NewRecorder() | ||
| handler := IndexHTMLHandler(fsys, log, "/prefix") | ||
|
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| handler.ServeHTTP(w, req) | ||
|
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| resp := w.Result() | ||
| body, _ := io.ReadAll(resp.Body) | ||
|
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| // Check the status code | ||
| if resp.StatusCode != http.StatusOK { | ||
| t.Errorf("expected status OK; got %v", resp.StatusCode) | ||
| } | ||
|
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| // Check that the base tag was injected | ||
| if !strings.Contains(string(body), `<base href="/prefix/">`) { | ||
| t.Errorf("base tag not injected correctly: %v", string(body)) | ||
| } | ||
| }) | ||
|
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| t.Run("file not found", func(t *testing.T) { | ||
| brokenFS, err := fs.Sub(os.DirFS("testdata"), "nonexistent") | ||
| if err != nil { | ||
| t.Fatalf("failed to create fs: %v", err) | ||
| } | ||
| req := httptest.NewRequest("GET", "https://example.com/foo", nil) | ||
| w := httptest.NewRecorder() | ||
| handler := IndexHTMLHandler(brokenFS, log, "/prefix") | ||
|
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| handler.ServeHTTP(w, req) | ||
|
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| resp := w.Result() | ||
|
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| // Check the status code | ||
| if resp.StatusCode != http.StatusInternalServerError { | ||
| t.Errorf("expected status InternalServerError; got %v", resp.StatusCode) | ||
| } | ||
| }) | ||
| } | ||
|
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| func TestAssetHandlerFunc(t *testing.T) { | ||
| // Mock assetHandler to just record that it was called and with what request | ||
| assetHandler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { | ||
| w.Write([]byte("assetHandler called")) | ||
| }) | ||
|
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| // Mock redirector to just record that it was called and with what request | ||
| redirector := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) { | ||
| w.Write([]byte("redirector called")) | ||
| }) | ||
|
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| handler := AssetHandler(assetHandler, redirector) | ||
|
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| tests := []struct { | ||
| name string | ||
| requestURI string | ||
| wantStatus int | ||
| wantBody string | ||
| }{ | ||
| { | ||
| name: "Asset request with extension", | ||
| requestURI: "/static/somefile.js", | ||
| wantStatus: http.StatusOK, | ||
| wantBody: "assetHandler called", | ||
| }, | ||
| { | ||
| name: "Non-asset request", | ||
| requestURI: "/some-page", | ||
| wantStatus: http.StatusOK, | ||
| wantBody: "redirector called", | ||
| }, | ||
| } | ||
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| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| req, err := http.NewRequest("GET", tt.requestURI, nil) | ||
| if err != nil { | ||
| t.Fatalf("could not create request: %v", err) | ||
| } | ||
|
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| rr := httptest.NewRecorder() | ||
| handler(rr, req) | ||
|
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| if rr.Code != tt.wantStatus { | ||
| t.Errorf("handler returned wrong status code: got %v want %v", | ||
| rr.Code, tt.wantStatus) | ||
| } | ||
|
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| if rr.Body.String() != tt.wantBody { | ||
| t.Errorf("handler returned unexpected body: got %v want %v", | ||
| rr.Body.String(), tt.wantBody) | ||
| } | ||
| }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| <html> | ||
| <head></head> | ||
| <body> | ||
| <h1>Index</h1> | ||
| </body> | ||
| </html> |