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4cdb8f78cb
This change is to work around the issue that chromium based browsers have handling the "name=orig" parameter appended to URLs. This parameter is needed to retrieve the full resolution image from twitter, but causes those browsers to fill in "jpg_name=orig" as the extension on the filename. This change adds a new endpoint, "/pic/orig/<encoded media>". This new endpoint will internally fetch the URL with ":orig" appended on the end for the full res image. Externally, the endpoint will serve the image without the extra parameter to expose the real extension to the browser. This new endpoint is used when rendering tweets with attached images. The old endpoint is still in place for all other proxied images, and for any legacy links. I also updated the "?name=small" parameter to ":small" since that seems to be the new pattern for image sizing. This should fix issue #458.
61 lines
1.4 KiB
Nim
61 lines
1.4 KiB
Nim
# SPDX-License-Identifier: AGPL-3.0-only
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import strutils, strformat, uri, tables, base64
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import nimcrypto
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var
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hmacKey: string
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base64Media = false
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const
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https* = "https://"
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twimg* = "pbs.twimg.com/"
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nitterParams = ["name", "tab", "id", "list", "referer", "scroll"]
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twitterDomains = @[
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"twitter.com",
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"pic.twitter.com",
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"twimg.com",
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"abs.twimg.com",
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"pbs.twimg.com",
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"video.twimg.com"
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]
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proc setHmacKey*(key: string) =
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hmacKey = key
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proc setProxyEncoding*(state: bool) =
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base64Media = state
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proc getHmac*(data: string): string =
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($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)
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if base64Media:
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&"/video/enc/{sig}/{encode(link, safe=true)}"
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else:
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&"/video/{sig}/{encodeUrl(link)}"
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proc getPicUrl*(link: string): string =
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if base64Media:
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&"/pic/enc/{encode(link, safe=true)}"
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else:
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&"/pic/{encodeUrl(link)}"
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proc getOrigPicUrl*(link: string): string =
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if base64Media:
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&"/pic/orig/enc/{encode(link, safe=true)}"
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else:
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&"/pic/orig/{encodeUrl(link)}"
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proc filterParams*(params: Table): seq[(string, string)] =
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for p in params.pairs():
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if p[1].len > 0 and p[0] notin nitterParams:
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result.add p
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proc isTwitterUrl*(uri: Uri): bool =
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uri.hostname in twitterDomains
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proc isTwitterUrl*(url: string): bool =
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parseUri(url).hostname in twitterDomains
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