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// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package api4
import (
"net/http"
l4g "github.com/alecthomas/log4go"
"github.com/mattermost/platform/app"
"github.com/mattermost/platform/model"
"github.com/mattermost/platform/utils"
)
const OPEN_GRAPH_METADATA_CACHE_SIZE = 10000
var openGraphDataCache = utils.NewLru(OPEN_GRAPH_METADATA_CACHE_SIZE)
func InitOpenGraph() {
l4g.Debug(utils.T("api.opengraph.init.debug"))
BaseRoutes.OpenGraph.Handle("", ApiSessionRequired(getOpenGraphMetadata)).Methods("POST")
}
func getOpenGraphMetadata(c *Context, w http.ResponseWriter, r *http.Request) {
if !*utils.Cfg.ServiceSettings.EnableLinkPreviews {
c.Err = model.NewAppError("getOpenGraphMetadata", "api.post.link_preview_disabled.app_error", nil, "", http.StatusNotImplemented)
return
}
props := model.StringInterfaceFromJson(r.Body)
url := ""
ok := false
if url, ok = props["url"].(string); len(url) == 0 || !ok {
c.SetInvalidParam("url")
return
}
ogJSONGeneric, ok := openGraphDataCache.Get(url)
if ok {
w.Write(ogJSONGeneric.([]byte))
return
}
og := app.GetOpenGraphMetadata(url)
ogJSON, err := og.ToJSON()
openGraphDataCache.AddWithExpiresInSecs(props["url"], ogJSON, 3600) // Cache would expire after 1 hour
if err != nil {
w.Write([]byte(`{"url": ""}`))
return
}
w.Write(ogJSON)
}
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