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icons.go
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icons.go
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package main
import (
"net/http"
"net/url"
// "fmt"
"strings"
"os"
"io/ioutil"
"encoding/json"
"path"
"time"
"context"
"go.deanishe.net/favicon"
"github.com/azukaar/cosmos-server/src/utils"
)
type CachedImage struct {
ContentType string
ETag string
Body []byte
}
func httpGetWithTimeout(url string) (*http.Response, error) {
timeout := 10 * time.Second
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return nil, err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
return resp, nil
}
var IconCache = make(map[string]CachedImage)
func sendImage(w http.ResponseWriter, image CachedImage) {
// Copy the response to the output
w.Header().Set("Content-Type", image.ContentType)
w.Header().Set("ETag", image.ETag)
w.Header().Set("Cache-Control", "max-age=86400")
w.WriteHeader(http.StatusOK)
w.Write(image.Body)
}
func sendFallback(w http.ResponseWriter) {
// Send the fallback image
pwd,_ := os.Getwd()
imgsrc := "cosmos_gray.png"
fallback, err := ioutil.ReadFile(pwd + "/" + imgsrc)
if err != nil {
utils.Error("Favicon: fallback", err)
utils.HTTPError(w, "Favicon", http.StatusInternalServerError, "FA003")
return
}
w.Header().Set("Content-Type", "image/png")
w.Header().Set("Cache-Control", "max-age=5")
w.WriteHeader(http.StatusOK)
w.Write(fallback)
}
var IconCacheLock = make(chan bool, 1)
func GetFavicon(w http.ResponseWriter, req *http.Request) {
if utils.LoggedInOnly(w, req) != nil {
return
}
// get url from query string
escsiteurl := req.URL.Query().Get("q")
IconCacheLock <- true
defer func() { <-IconCacheLock }()
// URL decode
siteurl, err := url.QueryUnescape(escsiteurl)
if err != nil {
utils.Error("Favicon: URL decode", err)
utils.HTTPError(w, "URL decode", http.StatusInternalServerError, "FA002")
return
}
if(req.Method == "GET") {
utils.Log("Fetch favicon for " + siteurl)
// Check if we have the favicon in cache
if _, ok := IconCache[siteurl]; ok {
utils.Debug("Favicon in cache")
resp := IconCache[siteurl]
sendImage(w, resp)
return
}
var icons []*favicon.Icon
var defaultIcons = []*favicon.Icon{
&favicon.Icon{URL: "favicon.png", Width: 0},
&favicon.Icon{URL: "/favicon.png", Width: 0},
&favicon.Icon{URL: "favicon.ico", Width: 0},
&favicon.Icon{URL: "/favicon.ico", Width: 0},
}
// follow siteurl and check if any redirect.
respNew, err := httpGetWithTimeout(siteurl)
if err != nil {
utils.Error("FaviconFetch", err)
icons = append(icons, defaultIcons...)
} else {
siteurl = respNew.Request.URL.String()
icons, err = favicon.Find(siteurl)
if err != nil || len(icons) == 0 {
icons = append(icons, defaultIcons...)
} else {
// Check if icons list is missing any default values
for _, defaultIcon := range defaultIcons {
found := false
for _, icon := range icons {
if icon.URL == defaultIcon.URL {
found = true
break
}
}
if !found {
icons = append(icons, defaultIcon)
}
}
}
}
for _, icon := range icons {
if icon.Width <= 256 {
iconURL := icon.URL
u, err := url.Parse(siteurl)
if err != nil {
utils.Debug("FaviconFetch failed to parse " + err.Error())
continue
}
if !strings.HasPrefix(iconURL, "http") {
if strings.HasPrefix(iconURL, ".") {
// Relative URL starting with "."
// Resolve the relative URL based on the base URL
baseURL := u.Scheme + "://" + u.Host
iconURL = baseURL + iconURL[1:]
} else if strings.HasPrefix(iconURL, "/") {
// Relative URL starting with "/"
// Append the relative URL to the base URL
iconURL = u.Scheme + "://" + u.Host + iconURL
} else {
// Relative URL without starting dot or slash
// Construct the absolute URL based on the current page's URL path
baseURL := u.Scheme + "://" + u.Host
baseURLPath := path.Dir(u.Path)
iconURL = baseURL + baseURLPath + "/" + iconURL
}
}
utils.Debug("Favicon Trying to fetch " + iconURL)
// Fetch the favicon
resp, err := httpGetWithTimeout(iconURL)
if err != nil {
utils.Debug("FaviconFetch" + err.Error())
continue
}
// check if 200 and if image
if resp.StatusCode != 200 {
utils.Debug("FaviconFetch - " + iconURL + " - not 200 ")
continue
} else if !strings.Contains(resp.Header.Get("Content-Type"), "image") && !strings.Contains(resp.Header.Get("Content-Type"), "octet-stream") {
utils.Debug("FaviconFetch - " + iconURL + " - not image ")
continue
} else {
utils.Log("Favicon found " + iconURL)
// Cache the response
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
utils.Debug("FaviconFetch - cant read " + err.Error())
continue
}
finalImage := CachedImage{
ContentType: resp.Header.Get("Content-Type"),
ETag: resp.Header.Get("ETag"),
Body: body,
}
IconCache[siteurl] = finalImage
sendImage(w, IconCache[siteurl])
return
}
}
}
utils.Log("Favicon final fallback")
sendFallback(w)
return
} else {
utils.Error("Favicon: Method not allowed" + req.Method, nil)
utils.HTTPError(w, "Method not allowed", http.StatusMethodNotAllowed, "HTTP001")
return
}
}
func PingURL(w http.ResponseWriter, req *http.Request) {
if utils.LoggedInOnly(w, req) != nil {
return
}
// get url from query string
escsiteurl := req.URL.Query().Get("q")
// URL decode
siteurl, err := url.QueryUnescape(escsiteurl)
if err != nil {
utils.Error("Ping: URL decode", err)
utils.HTTPError(w, "Ping URL decode", http.StatusInternalServerError, "FA002")
return
}
if(req.Method == "GET") {
utils.Log("Ping for " + siteurl)
resp, err := httpGetWithTimeout(siteurl)
if err != nil {
utils.Error("Ping", err)
utils.HTTPError(w, "URL decode", http.StatusInternalServerError, "PI0001")
return
}
if resp.StatusCode >= 500 {
utils.Error("Ping", err)
utils.HTTPError(w, "URL decode", http.StatusInternalServerError, "PI0002")
return
}
json.NewEncoder(w).Encode(map[string]interface{}{
"status": "OK",
"data": map[string]interface{}{
},
})
} else {
utils.Error("Favicon: Method not allowed" + req.Method, nil)
utils.HTTPError(w, "Method not allowed", http.StatusMethodNotAllowed, "HTTP001")
return
}
}
func SendLogo(w http.ResponseWriter, req *http.Request) {
pwd,_ := os.Getwd()
imgsrc := "Logo.png"
Logo, err := ioutil.ReadFile(pwd + "/" + imgsrc)
if err != nil {
utils.Error("Logo", err)
utils.HTTPError(w, "Favicon", http.StatusInternalServerError, "FA003")
return
}
w.Header().Set("Content-Type", "image/png")
w.Header().Set("Cache-Control", "max-age=5")
w.WriteHeader(http.StatusOK)
w.Write(Logo)
}