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77 lines
2.1 KiB
Go
77 lines
2.1 KiB
Go
package favicon
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import (
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"errors"
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"net/http"
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"github.com/yusing/go-proxy/internal/gperr"
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"github.com/yusing/go-proxy/internal/homepage"
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"github.com/yusing/go-proxy/internal/net/gphttp"
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"github.com/yusing/go-proxy/internal/route/routes"
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)
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// GetFavIcon returns the favicon of the route
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//
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// Returns:
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// - 200 OK: if icon found
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// - 400 Bad Request: if alias is empty or route is not HTTPRoute
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// - 404 Not Found: if route or icon not found
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// - 500 Internal Server Error: if internal error
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// - others: depends on route handler response
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func GetFavIcon(w http.ResponseWriter, req *http.Request) {
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url, alias := req.FormValue("url"), req.FormValue("alias")
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if url == "" && alias == "" {
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gphttp.ClientError(w, gphttp.ErrMissingKey("url or alias"), http.StatusBadRequest)
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return
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}
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if url != "" && alias != "" {
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gphttp.ClientError(w, gperr.New("url and alias are mutually exclusive"), http.StatusBadRequest)
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return
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}
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// try with url
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if url != "" {
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var iconURL homepage.IconURL
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if err := iconURL.Parse(url); err != nil {
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gphttp.ClientError(w, err, http.StatusBadRequest)
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return
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}
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fetchResult := homepage.FetchFavIconFromURL(&iconURL)
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if !fetchResult.OK() {
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http.Error(w, fetchResult.ErrMsg, fetchResult.StatusCode)
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return
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}
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w.Header().Set("Content-Type", fetchResult.ContentType())
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gphttp.WriteBody(w, fetchResult.Icon)
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return
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}
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// try with route.Icon
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r, ok := routes.GetHTTPRoute(alias)
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if !ok {
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gphttp.ClientError(w, errors.New("no such route"), http.StatusNotFound)
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return
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}
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var result *homepage.FetchResult
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hp := r.HomepageItem()
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if hp.Icon != nil {
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if hp.Icon.IconSource == homepage.IconSourceRelative {
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result = homepage.FindIcon(req.Context(), r, hp.Icon.Value)
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} else {
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result = homepage.FetchFavIconFromURL(hp.Icon)
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}
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} else {
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// try extract from "link[rel=icon]"
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result = homepage.FindIcon(req.Context(), r, "/")
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}
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if result.StatusCode == 0 {
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result.StatusCode = http.StatusOK
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}
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if !result.OK() {
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http.Error(w, result.ErrMsg, result.StatusCode)
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return
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}
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w.Header().Set("Content-Type", result.ContentType())
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gphttp.WriteBody(w, result.Icon)
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}
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