fastpastebin/domains/pastes/paste_get.go

338 lines
11 KiB
Go

package pastes
import (
// stdlib
"bytes"
"net/http"
"strconv"
"time"
// local
"go.dev.pztrn.name/fastpastebin/internal/structs"
"go.dev.pztrn.name/fastpastebin/internal/templater"
// other
"github.com/alecthomas/chroma"
"github.com/alecthomas/chroma/formatters"
htmlfmt "github.com/alecthomas/chroma/formatters/html"
"github.com/alecthomas/chroma/lexers"
"github.com/alecthomas/chroma/styles"
"github.com/labstack/echo"
)
const (
pasteCookieInvalid = "PASTE_COOKIE_INVALID"
pasteExpired = "PASTE_EXPIRED"
pasteNotFound = "PASTE_NOT_FOUND"
pasteTimestampInvalid = "PASTE_TIMESTAMP_INVALID"
)
// Actual getting paste data and returns it's content without formatting.
// This function will return paste's structure and optional error string
// that defined in constants above.
// Actually required only paste ID, all other parameters are optional
// for some cases, e.g. public paste won't check for timestamp and cookie
// value (they both will be ignored), but private will.
func pasteGetData(pasteID int, timestamp int64, cookieValue string) (*structs.Paste, string) {
// Get paste.
paste, err1 := c.Database.GetPaste(pasteID)
if err1 != nil {
c.Logger.Error().Err(err1).Int("paste ID", pasteID).Msg("Failed to get paste")
return nil, pasteNotFound
}
// Check if paste is expired.
if paste.IsExpired() {
c.Logger.Error().Int("paste ID", pasteID).Msg("Paste is expired")
return nil, pasteExpired
}
// Check if we have a private paste and it's parameters are correct.
if paste.Private {
pasteTs := paste.CreatedAt.Unix()
if timestamp != pasteTs {
c.Logger.Error().Int("paste ID", pasteID).Int64("paste timestamp", pasteTs).Int64("provided timestamp", timestamp).Msg("Incorrect timestamp provided for private paste")
return nil, pasteTimestampInvalid
}
}
// If we have a private paste requested and password for that paste
// was defined - check additional things that required to view this
// paste.
if paste.Private && paste.Password != "" {
// Generate cookie value to check.
pasteCookieValue := paste.GenerateCryptedCookieValue()
if cookieValue != pasteCookieValue {
return nil, pasteCookieInvalid
}
}
return paste, ""
}
// GET for "/paste/PASTE_ID" and "/paste/PASTE_ID/TIMESTAMP" (private pastes).
// Web interface version.
func pasteGETWebInterface(ec echo.Context) error {
pasteIDRaw := ec.Param("id")
// We already get numbers from string, so we will not check strconv.Atoi()
// error.
pasteID, _ := strconv.Atoi(regexInts.FindAllString(pasteIDRaw, 1)[0])
pasteIDStr := strconv.Itoa(pasteID)
c.Logger.Debug().Int("paste ID", pasteID).Msg("Trying to get paste data")
// Check if we have timestamp passed.
// If passed timestamp is invalid (isn't a real UNIX timestamp) we
// will show 404 Not Found error and spam about that in logs.
var timestamp int64
tsProvidedStr := ec.Param("timestamp")
if tsProvidedStr != "" {
tsProvided, err := strconv.ParseInt(tsProvidedStr, 10, 64)
if err != nil {
c.Logger.Error().Err(err).Int("paste ID", pasteID).Int64("provided timestamp", tsProvided).Msg("Invalid timestamp provided for getting private paste")
errtpl := templater.GetErrorTemplate(ec, "Paste #"+pasteIDStr+" not found")
return ec.HTML(http.StatusBadRequest, errtpl)
}
timestamp = tsProvided
}
// Check if we have "PASTE-PASTEID" cookie defined. It is required
// for private pastes.
var cookieValue string
cookie, err1 := ec.Cookie("PASTE-" + pasteIDStr)
if err1 == nil {
cookieValue = cookie.Value
}
paste, error := pasteGetData(pasteID, timestamp, cookieValue)
// For these cases we should return 404 Not Found page.
if error == pasteExpired || error == pasteNotFound || error == pasteTimestampInvalid {
errtpl := templater.GetErrorTemplate(ec, "Paste #"+pasteIDRaw+" not found")
return ec.HTML(http.StatusNotFound, errtpl)
}
// If passed cookie value was invalid - go to paste authorization
// page.
if error == pasteCookieInvalid {
c.Logger.Info().Int("paste ID", pasteID).Msg("Invalid cookie, redirecting to auth page")
return ec.Redirect(http.StatusMovedPermanently, "/paste/"+pasteIDStr+"/"+ec.Param("timestamp")+"/verify")
}
// Format paste data map.
pasteData := make(map[string]string)
pasteData["pasteTitle"] = paste.Title
pasteData["pasteID"] = strconv.Itoa(paste.ID)
pasteData["pasteDate"] = paste.CreatedAt.Format("2006-01-02 @ 15:04:05") + " UTC"
pasteData["pasteLanguage"] = paste.Language
pasteExpirationString := "Never"
if paste.KeepFor != 0 && paste.KeepForUnitType != 0 {
pasteExpirationString = paste.GetExpirationTime().Format("2006-01-02 @ 15:04:05") + " UTC"
}
pasteData["pasteExpiration"] = pasteExpirationString
if paste.Private {
pasteData["pasteType"] = "<span class='has-text-danger'>Private</span>"
pasteData["pasteTs"] = strconv.FormatInt(paste.CreatedAt.Unix(), 10) + "/"
} else {
pasteData["pasteType"] = "<span class='has-text-success'>Public</span>"
pasteData["pasteTs"] = ""
}
// Highlight.
// Get lexer.
lexer := lexers.Get(paste.Language)
if lexer == nil {
lexer = lexers.Fallback
}
// Tokenize paste data.
lexered, err3 := lexer.Tokenise(nil, paste.Data)
if err3 != nil {
c.Logger.Error().Err(err3).Msg("Failed to tokenize paste data")
}
// Get style for HTML output.
style := styles.Get("monokai")
if style == nil {
style = styles.Fallback
}
// Get HTML formatter.
formatter := chroma.Formatter(htmlfmt.New(htmlfmt.WithLineNumbers(), htmlfmt.LineNumbersInTable()))
if formatter == nil {
formatter = formatters.Fallback
}
// Create buffer and format into it.
buf := new(bytes.Buffer)
err4 := formatter.Format(buf, style, lexered)
if err4 != nil {
c.Logger.Error().Err(err4).Msg("Failed to format paste data")
}
pasteData["pastedata"] = buf.String()
// Get template and format it.
pasteHTML := templater.GetTemplate(ec, "paste.html", pasteData)
return ec.HTML(http.StatusOK, pasteHTML)
}
// GET for "/paste/PASTE_ID/TIMESTAMP/verify" - a password verify page.
func pastePasswordedVerifyGet(ec echo.Context) error {
pasteIDRaw := ec.Param("id")
timestampRaw := ec.Param("timestamp")
// We already get numbers from string, so we will not check strconv.Atoi()
// error.
pasteID, _ := strconv.Atoi(regexInts.FindAllString(pasteIDRaw, 1)[0])
// Get paste.
paste, err1 := c.Database.GetPaste(pasteID)
if err1 != nil {
c.Logger.Error().Err(err1).Int("paste ID", pasteID).Msg("Failed to get paste data")
errtpl := templater.GetErrorTemplate(ec, "Paste #"+pasteIDRaw+" not found")
return ec.HTML(http.StatusBadRequest, errtpl)
}
// Check for auth cookie. If present - redirect to paste.
cookie, err := ec.Cookie("PASTE-" + strconv.Itoa(pasteID))
if err == nil {
// No cookie, redirect to auth page.
c.Logger.Debug().Msg("Paste cookie found, checking it...")
// Generate cookie value to check.
cookieValue := paste.GenerateCryptedCookieValue()
if cookieValue == cookie.Value {
c.Logger.Info().Msg("Valid cookie, redirecting to paste page...")
return ec.Redirect(http.StatusMovedPermanently, "/paste/"+pasteIDRaw+"/"+ec.Param("timestamp"))
}
c.Logger.Debug().Msg("Invalid cookie, showing auth page")
}
// HTML data.
htmlData := make(map[string]string)
htmlData["pasteID"] = strconv.Itoa(pasteID)
htmlData["pasteTimestamp"] = timestampRaw
verifyHTML := templater.GetTemplate(ec, "passworded_paste_verify.html", htmlData)
return ec.HTML(http.StatusOK, verifyHTML)
}
// POST for "/paste/PASTE_ID/TIMESTAMP/verify" - a password verify page.
func pastePasswordedVerifyPost(ec echo.Context) error {
// We should check if database connection available.
dbConn := c.Database.GetDatabaseConnection()
if c.Config.Database.Type != "flatfiles" && dbConn == nil {
return ec.Redirect(http.StatusFound, "/database_not_available")
}
pasteIDRaw := ec.Param("id")
timestampRaw := ec.Param("timestamp")
// We already get numbers from string, so we will not check strconv.Atoi()
// error.
pasteID, _ := strconv.Atoi(regexInts.FindAllString(pasteIDRaw, 1)[0])
c.Logger.Debug().Int("paste ID", pasteID).Msg("Requesting paste")
// Get paste.
paste, err1 := c.Database.GetPaste(pasteID)
if err1 != nil {
c.Logger.Error().Err(err1).Int("paste ID", pasteID).Msg("Failed to get paste")
errtpl := templater.GetErrorTemplate(ec, "Paste #"+strconv.Itoa(pasteID)+" not found")
return ec.HTML(http.StatusBadRequest, errtpl)
}
params, err2 := ec.FormParams()
if err2 != nil {
c.Logger.Debug().Msg("No form parameters passed")
errtpl := templater.GetErrorTemplate(ec, "Paste #"+strconv.Itoa(pasteID)+" not found")
return ec.HTML(http.StatusBadRequest, errtpl)
}
if paste.VerifyPassword(params["paste-password"][0]) {
// Set cookie that this paste's password is verified and paste
// can be viewed.
cookie := new(http.Cookie)
cookie.Name = "PASTE-" + strconv.Itoa(pasteID)
cookie.Value = paste.GenerateCryptedCookieValue()
cookie.Expires = time.Now().Add(24 * time.Hour)
ec.SetCookie(cookie)
return ec.Redirect(http.StatusFound, "/paste/"+strconv.Itoa(pasteID)+"/"+timestampRaw)
}
errtpl := templater.GetErrorTemplate(ec, "Invalid password. Please, try again.")
return ec.HTML(http.StatusBadRequest, errtpl)
}
// GET for "/pastes/:id/raw", raw paste output.
// Web interface version.
func pasteRawGETWebInterface(ec echo.Context) error {
// We should check if database connection available.
dbConn := c.Database.GetDatabaseConnection()
if c.Config.Database.Type != "flatfiles" && dbConn == nil {
return ec.Redirect(http.StatusFound, "/database_not_available/raw")
}
pasteIDRaw := ec.Param("id")
// We already get numbers from string, so we will not check strconv.Atoi()
// error.
pasteID, _ := strconv.Atoi(regexInts.FindAllString(pasteIDRaw, 1)[0])
c.Logger.Debug().Int("paste ID", pasteID).Msg("Requesting paste data")
// Get paste.
paste, err1 := c.Database.GetPaste(pasteID)
if err1 != nil {
c.Logger.Error().Err(err1).Int("paste ID", pasteID).Msg("Failed to get paste from database")
return ec.HTML(http.StatusBadRequest, "Paste #"+pasteIDRaw+" does not exist.")
}
if paste.IsExpired() {
c.Logger.Error().Int("paste ID", pasteID).Msg("Paste is expired")
return ec.HTML(http.StatusBadRequest, "Paste #"+pasteIDRaw+" does not exist.")
}
// Check if we have a private paste and it's parameters are correct.
if paste.Private {
tsProvidedStr := ec.Param("timestamp")
tsProvided, err2 := strconv.ParseInt(tsProvidedStr, 10, 64)
if err2 != nil {
c.Logger.Error().Err(err2).Int("paste ID", pasteID).Str("provided timestamp", tsProvidedStr).Msg("Invalid timestamp provided for getting private paste")
return ec.String(http.StatusBadRequest, "Paste #"+pasteIDRaw+" not found")
}
pasteTs := paste.CreatedAt.Unix()
if tsProvided != pasteTs {
c.Logger.Error().Int("paste ID", pasteID).Int64("provided timestamp", tsProvided).Int64("paste timestamp", pasteTs).Msg("Incorrect timestamp provided for private paste")
return ec.String(http.StatusBadRequest, "Paste #"+pasteIDRaw+" not found")
}
}
// nolint
// ToDo: figure out how to handle passworded pastes here.
// Return error for now.
if paste.Password != "" {
c.Logger.Error().Int("paste ID", pasteID).Msg("Cannot render paste as raw: passworded paste. Patches welcome!")
return ec.String(http.StatusBadRequest, "Paste #"+pasteIDRaw+" not found")
}
return ec.String(http.StatusOK, paste.Data)
}