nitter/src/utils.nim

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