nitter/src/utils.nim
2021-12-27 02:37:38 +01:00

62 lines
1.6 KiB
Nim

# SPDX-License-Identifier: AGPL-3.0-only
import strutils, strformat, sequtils, uri, tables, base64
import nimcrypto, regex
var
hmacKey {.threadvar.}: string
base64Media = false
const
https* = "https://"
twimg* = "pbs.twimg.com/"
badJpgExts = @["1500x500", "jpgn", "jpg:", "jpg_", "_jpg"]
badPngExts = @["pngn", "png:", "png_", "_png"]
twitterDomains = @[
"twitter.com",
"pic.twitter.com",
"twimg.com",
"abs.twimg.com",
"pbs.twimg.com",
"video.twimg.com"
]
proc setHmacKey*(key: string) =
hmacKey = key
proc setProxyEncoding*(state: bool) =
base64Media = state
proc getHmac*(data: string): string =
($hmac(sha256, hmacKey, data))[0 .. 12]
proc getVidUrl*(link: string): string =
if link.len == 0: return
let sig = getHmac(link)
if base64Media:
&"/video/enc/{sig}/{encode(link, safe=true)}"
else:
&"/video/{sig}/{encodeUrl(link)}"
proc getPicUrl*(link: string): string =
if base64Media:
&"/pic/enc/{encode(link, safe=true)}"
else:
&"/pic/{encodeUrl(link)}"
proc cleanFilename*(filename: string): string =
const reg = re"[^A-Za-z0-9._-]"
result = filename.replace(reg, "_")
if badJpgExts.anyIt(it in result):
result &= ".jpg"
elif badPngExts.anyIt(it in result):
result &= ".png"
proc filterParams*(params: Table): seq[(string, string)] =
const filter = ["name", "id", "list", "referer", "scroll"]
toSeq(params.pairs()).filterIt(it[0] notin filter and it[1].len > 0)
proc isTwitterUrl*(uri: Uri): bool =
uri.hostname in twitterDomains
proc isTwitterUrl*(url: string): bool =
parseUri(url).hostname in twitterDomains