111 lines
3 KiB
Go
111 lines
3 KiB
Go
package main
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import (
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"html/template"
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"io"
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"net/http"
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"regexp"
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"strconv"
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"github.com/labstack/echo"
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)
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// Template wraps a template.Template for echo.
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type Template struct {
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templates *template.Template
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}
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type publicTpl struct {
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Title string
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Description string
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}
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type unsubTpl struct {
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publicTpl
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Unsubscribe bool
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Blacklist bool
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}
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type errorTpl struct {
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publicTpl
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ErrorTitle string
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ErrorMessage string
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}
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var regexValidUUID = regexp.MustCompile("^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-4[a-fA-F0-9]{3}-[8|9|aA|bB][a-fA-F0-9]{3}-[a-fA-F0-9]{12}$")
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// Render executes and renders a template for echo.
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func (t *Template) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
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return t.templates.ExecuteTemplate(w, name, data)
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}
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// handleUnsubscribePage unsubscribes a subscriber and renders a view.
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func handleUnsubscribePage(c echo.Context) error {
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var (
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app = c.Get("app").(*App)
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campUUID = c.Param("campUUID")
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subUUID = c.Param("subUUID")
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unsub, _ = strconv.ParseBool(c.FormValue("unsubscribe"))
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blacklist, _ = strconv.ParseBool(c.FormValue("blacklist"))
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out = unsubTpl{}
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)
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out.Unsubscribe = unsub
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out.Blacklist = blacklist
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out.Title = "Unsubscribe from mailing list"
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if !regexValidUUID.MatchString(campUUID) ||
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!regexValidUUID.MatchString(subUUID) {
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return c.Render(http.StatusBadRequest, "error",
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makeErrorTpl("Invalid request", "",
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`The unsubscription request contains invalid IDs.
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Please click on the correct link.`))
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}
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// Unsubscribe.
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if unsub {
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res, err := app.Queries.Unsubscribe.Exec(campUUID, subUUID, blacklist)
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if err != nil {
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app.Logger.Printf("Error unsubscribing : %v", err)
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return echo.NewHTTPError(http.StatusBadRequest, "There was an internal error while unsubscribing you.")
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}
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if !blacklist {
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num, _ := res.RowsAffected()
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if num == 0 {
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return c.Render(http.StatusBadRequest, "error",
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makeErrorTpl("Already unsubscribed", "",
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`Looks like you are not subscribed to this mailing list.
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You may have already unsubscribed.`))
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}
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}
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}
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return c.Render(http.StatusOK, "unsubscribe", out)
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}
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// handleLinkRedirect handles link UUID to real link redirection.
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func handleLinkRedirect(c echo.Context) error {
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var (
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app = c.Get("app").(*App)
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linkUUID = c.Param("linkUUID")
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campUUID = c.Param("campUUID")
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subUUID = c.Param("subUUID")
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)
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if !regexValidUUID.MatchString(linkUUID) ||
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!regexValidUUID.MatchString(campUUID) ||
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!regexValidUUID.MatchString(subUUID) {
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return c.Render(http.StatusBadRequest, "error",
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makeErrorTpl("Invalid link", "", "The link you clicked is invalid."))
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}
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var url string
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if err := app.Queries.RegisterLinkClick.Get(&url, linkUUID, campUUID, subUUID); err != nil {
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app.Logger.Printf("error fetching redirect link: %s", err)
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return c.Render(http.StatusInternalServerError, "error",
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makeErrorTpl("Error opening link", "", "There was an error opening the link. Please try later."))
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}
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return c.Redirect(http.StatusTemporaryRedirect, url)
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}
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