mirror of https://github.com/grafana/grafana.git
100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
package pluginproxy
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"net/http/httputil"
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"net/url"
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"text/template"
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"github.com/grafana/grafana/pkg/bus"
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"github.com/grafana/grafana/pkg/log"
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"github.com/grafana/grafana/pkg/middleware"
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m "github.com/grafana/grafana/pkg/models"
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"github.com/grafana/grafana/pkg/plugins"
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"github.com/grafana/grafana/pkg/util"
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)
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type templateData struct {
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JsonData map[string]interface{}
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SecureJsonData map[string]string
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}
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func getHeaders(route *plugins.AppPluginRoute, orgId int64, appId string) (http.Header, error) {
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result := http.Header{}
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query := m.GetPluginSettingByIdQuery{OrgId: orgId, PluginId: appId}
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if err := bus.Dispatch(&query); err != nil {
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return nil, err
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}
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data := templateData{
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JsonData: query.Result.JsonData,
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SecureJsonData: query.Result.SecureJsonData.Decrypt(),
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}
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for _, header := range route.Headers {
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var contentBuf bytes.Buffer
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t, err := template.New("content").Parse(header.Content)
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if err != nil {
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return nil, errors.New(fmt.Sprintf("could not parse header content template for header %s.", header.Name))
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}
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err = t.Execute(&contentBuf, data)
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if err != nil {
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return nil, errors.New(fmt.Sprintf("failed to execute header content template for header %s.", header.Name))
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}
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log.Trace("Adding header to proxy request. %s: %s", header.Name, contentBuf.String())
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result.Add(header.Name, contentBuf.String())
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}
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return result, nil
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}
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func NewApiPluginProxy(ctx *middleware.Context, proxyPath string, route *plugins.AppPluginRoute, appId string) *httputil.ReverseProxy {
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targetUrl, _ := url.Parse(route.Url)
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director := func(req *http.Request) {
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req.URL.Scheme = targetUrl.Scheme
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req.URL.Host = targetUrl.Host
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req.Host = targetUrl.Host
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req.URL.Path = util.JoinUrlFragments(targetUrl.Path, proxyPath)
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// clear cookie headers
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req.Header.Del("Cookie")
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req.Header.Del("Set-Cookie")
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//Create a HTTP header with the context in it.
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ctxJson, err := json.Marshal(ctx.SignedInUser)
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if err != nil {
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ctx.JsonApiErr(500, "failed to marshal context to json.", err)
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return
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}
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req.Header.Add("X-Grafana-Context", string(ctxJson))
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if len(route.Headers) > 0 {
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headers, err := getHeaders(route, ctx.OrgId, appId)
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if err != nil {
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ctx.JsonApiErr(500, "Could not generate plugin route header", err)
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return
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}
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for key, value := range headers {
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log.Trace("setting key %v value %v", key, value[0])
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req.Header.Set(key, value[0])
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}
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}
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}
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return &httputil.ReverseProxy{Director: director}
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}
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