package pastes import ( "net/http" "regexp" "strconv" "strings" "time" "github.com/alecthomas/chroma/lexers" "github.com/labstack/echo" "go.dev.pztrn.name/fastpastebin/internal/captcha" "go.dev.pztrn.name/fastpastebin/internal/database/dialects/flatfiles" "go.dev.pztrn.name/fastpastebin/internal/structs" "go.dev.pztrn.name/fastpastebin/internal/templater" ) const KeepPastesForever = "forever" // POST for "/paste/" which will create new paste and redirect to // "/pastes/CREATED_PASTE_ID". This handler will do all the job for // requests comes from browsers via web interface. func pastePOSTWebInterface(ec echo.Context) error { // We should check if database connection available. dbConn := c.Database.GetDatabaseConnection() if c.Config.Database.Type != flatfiles.FlatFileDialect && dbConn == nil { return ec.Redirect(http.StatusFound, "/database_not_available") } params, err := ec.FormParams() if err != nil { c.Logger.Error().Msg("Passed paste form is empty") errtpl := templater.GetErrorTemplate(ec, "Cannot create empty paste") return ec.HTML(http.StatusBadRequest, errtpl) } c.Logger.Debug().Msgf("Received parameters: %+v", params) // Do nothing if paste contents is empty. if len(params["paste-contents"][0]) == 0 { c.Logger.Debug().Msg("Empty paste submitted, ignoring") errtpl := templater.GetErrorTemplate(ec, "Empty pastes aren't allowed.") return ec.HTML(http.StatusBadRequest, errtpl) } if !strings.ContainsAny(params["paste-keep-for"][0], "Mmhd") && params["paste-keep-for"][0] != KeepPastesForever { c.Logger.Debug().Str("field value", params["paste-keep-for"][0]).Msg("'Keep paste for' field have invalid value") errtpl := templater.GetErrorTemplate(ec, "Invalid 'Paste should be available for' parameter passed. Please do not try to hack us ;).") return ec.HTML(http.StatusBadRequest, errtpl) } // Verify captcha. if !captcha.Verify(params["paste-captcha-id"][0], params["paste-captcha-solution"][0]) { c.Logger.Debug().Str("captcha ID", params["paste-captcha-id"][0]).Str("captcha solution", params["paste-captcha-solution"][0]).Msg("Invalid captcha solution") errtpl := templater.GetErrorTemplate(ec, "Invalid captcha solution.") return ec.HTML(http.StatusBadRequest, errtpl) } paste := &structs.Paste{ Title: params["paste-title"][0], Data: params["paste-contents"][0], Language: params["paste-language"][0], } // Paste creation time in UTC. createdAt := time.Now().UTC() paste.CreatedAt = &createdAt // Parse "keep for" field. // Defaulting to "forever". keepFor := 0 keepForUnit := 0 if params["paste-keep-for"][0] != KeepPastesForever { keepForUnitRegex := regexp.MustCompile("[Mmhd]") keepForRaw := regexInts.FindAllString(params["paste-keep-for"][0], 1)[0] var err error keepFor, err = strconv.Atoi(keepForRaw) if err != nil { if params["paste-keep-for"][0] == KeepPastesForever { c.Logger.Debug().Msg("Keeping paste forever!") keepFor = 0 } else { c.Logger.Debug().Err(err).Msg("Failed to parse 'Keep for' integer") errtpl := templater.GetErrorTemplate(ec, "Invalid 'Paste should be available for' parameter passed. Please do not try to hack us ;).") return ec.HTML(http.StatusBadRequest, errtpl) } } keepForUnitRaw := keepForUnitRegex.FindAllString(params["paste-keep-for"][0], 1)[0] keepForUnit = structs.PasteKeepsCorrelation[keepForUnitRaw] } paste.KeepFor = keepFor paste.KeepForUnitType = keepForUnit // Try to autodetect if it was selected. if params["paste-language"][0] == "autodetect" { lexer := lexers.Analyse(params["paste-language"][0]) if lexer != nil { paste.Language = lexer.Config().Name } else { paste.Language = "text" } } // Private paste? paste.Private = false privateCheckbox, privateCheckboxFound := params["paste-private"] pastePassword, pastePasswordFound := params["paste-password"] if privateCheckboxFound && privateCheckbox[0] == "on" || pastePasswordFound && pastePassword[0] != "" { paste.Private = true } if pastePassword[0] != "" { _ = paste.CreatePassword(pastePassword[0]) } id, err2 := c.Database.SavePaste(paste) if err2 != nil { c.Logger.Error().Err(err2).Msg("Failed to save paste") errtpl := templater.GetErrorTemplate(ec, "Failed to save paste. Please, try again later.") return ec.HTML(http.StatusBadRequest, errtpl) } newPasteIDAsString := strconv.FormatInt(id, 10) c.Logger.Debug().Msg("Paste saved, URL: /paste/" + newPasteIDAsString) // Private pastes have it's timestamp in URL. if paste.Private { return ec.Redirect(http.StatusFound, "/paste/"+newPasteIDAsString+"/"+strconv.FormatInt(paste.CreatedAt.Unix(), 10)) } return ec.Redirect(http.StatusFound, "/paste/"+newPasteIDAsString) }