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authflow_wechat.go
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authflow_wechat.go
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package webapp
import (
htmltemplate "html/template"
"net/http"
"net/url"
"github.com/boombuler/barcode/qr"
"github.com/authgear/authgear-server/pkg/api/apierrors"
"github.com/authgear/authgear-server/pkg/auth/handler/webapp/viewmodels"
"github.com/authgear/authgear-server/pkg/auth/webapp"
"github.com/authgear/authgear-server/pkg/lib/authenticationflow/declarative"
"github.com/authgear/authgear-server/pkg/util/httproute"
coreimage "github.com/authgear/authgear-server/pkg/util/image"
"github.com/authgear/authgear-server/pkg/util/template"
"github.com/authgear/authgear-server/pkg/util/urlutil"
"github.com/authgear/authgear-server/pkg/util/wechat"
)
var TemplateWebAuthflowWechatHTML = template.RegisterHTML(
"web/authflow_wechat.html",
Components...,
)
func ConfigureAuthflowWechatRoute(route httproute.Route) httproute.Route {
return route.
WithMethods("OPTIONS", "GET", "POST").
WithPathPattern(webapp.AuthflowRouteWechat)
}
type AuthflowWechatViewModel struct {
ImageURI htmltemplate.URL
WechatRedirectURI htmltemplate.URL
}
type AuthflowWechatHandler struct {
Controller *AuthflowController
BaseViewModel *viewmodels.BaseViewModeler
Renderer Renderer
}
func (h *AuthflowWechatHandler) GetData(w http.ResponseWriter, r *http.Request, s *webapp.Session, screen *webapp.AuthflowScreenWithFlowResponse) (map[string]interface{}, error) {
data := make(map[string]interface{})
baseViewModel := h.BaseViewModel.ViewModelForAuthFlow(r, w)
viewmodels.Embed(data, baseViewModel)
screenData := screen.StateTokenFlowResponse.Action.Data.(declarative.OAuthData)
state := webapp.AuthflowOAuthState{
WebSessionID: s.ID,
XStep: screen.Screen.StateToken.XStep,
ErrorRedirectURI: (&url.URL{
Path: r.URL.Path,
RawQuery: r.URL.Query().Encode(),
}).String(),
}
authorizationURL, err := url.Parse(screenData.OAuthAuthorizationURL)
if err != nil {
return nil, err
}
authorizationURL = urlutil.WithQueryParamsAdded(authorizationURL, map[string]string{"state": state.Encode()})
img, err := CreateQRCodeImage(authorizationURL.String(), 512, 512, qr.M)
if err != nil {
return nil, err
}
dataURI, err := coreimage.DataURIFromImage(coreimage.CodecPNG, img)
if err != nil {
return nil, err
}
screenViewModel := AuthflowWechatViewModel{
// nolint: gosec
ImageURI: htmltemplate.URL(dataURI),
}
wechatRedirectURI := wechat.GetWeChatRedirectURI(r.Context())
if wechatRedirectURI != "" {
u, err := url.Parse(wechatRedirectURI)
if err != nil {
return nil, err
}
q := u.Query()
q.Set("state", state.Encode())
u.RawQuery = q.Encode()
// nolint: gosec
screenViewModel.WechatRedirectURI = htmltemplate.URL(u.String())
} else {
if baseViewModel.IsNativePlatform {
return nil, apierrors.NewInvalid("missing wechat redirect uri")
}
}
viewmodels.Embed(data, screenViewModel)
return data, nil
}
func (h *AuthflowWechatHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
var handlers AuthflowControllerHandlers
submit := func(s *webapp.Session, screen *webapp.AuthflowScreenWithFlowResponse) error {
data := screen.Screen.WechatCallbackData
input := map[string]interface{}{}
switch {
case data.Code != "":
input["code"] = data.Code
case data.Error != "":
input["error"] = data.Error
input["error_description"] = data.ErrorDescription
}
result, err := h.Controller.AdvanceWithInput(r, s, screen, input, nil)
if err != nil {
return err
}
result.WriteResponse(w, r)
return nil
}
handlers.Get(func(s *webapp.Session, screen *webapp.AuthflowScreenWithFlowResponse) error {
if screen.Screen.WechatCallbackData != nil {
return submit(s, screen)
}
// Otherwise render the page.
data, err := h.GetData(w, r, s, screen)
if err != nil {
return err
}
h.Renderer.RenderHTML(w, r, TemplateWebAuthflowWechatHTML, data)
return nil
})
handlers.PostAction("", func(s *webapp.Session, screen *webapp.AuthflowScreenWithFlowResponse) error {
if screen.Screen.WechatCallbackData != nil {
return submit(s, screen)
}
// Otherwise redirect to the same page.
redirectURI := &url.URL{
Path: r.URL.Path,
RawQuery: r.URL.Query().Encode(),
}
result := &webapp.Result{
NavigationAction: "replace",
RedirectURI: redirectURI.String(),
}
result.WriteResponse(w, r)
return nil
})
h.Controller.HandleStep(w, r, &handlers)
}