fix(vision): reject non-image files and enforce website policy (salvage #1940) - #3845
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#1940) Three safety gaps in vision_analyze_tool: 1. Local files accepted without checking if they're actually images — a renamed text file would get base64-encoded and sent to the model. Now validates magic bytes (PNG, JPEG, GIF, BMP, WebP, SVG). 2. No website policy enforcement on image URLs — blocked domains could be fetched via the vision tool. Now checks before download. 3. No redirect check — if an allowed URL redirected to a blocked domain, the download would proceed. Now re-checks the final URL. Fixed one test that needed _validate_image_url mocked to bypass DNS resolution on the fake blocked.test domain (is_safe_url does DNS checks that were added after the original PR). Co-authored-by: GutSlabs <GutSlabs@users.noreply.github.com>
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NousResearch#1940) (NousResearch#3845) Three safety gaps in vision_analyze_tool: 1. Local files accepted without checking if they're actually images — a renamed text file would get base64-encoded and sent to the model. Now validates magic bytes (PNG, JPEG, GIF, BMP, WebP, SVG). 2. No website policy enforcement on image URLs — blocked domains could be fetched via the vision tool. Now checks before download. 3. No redirect check — if an allowed URL redirected to a blocked domain, the download would proceed. Now re-checks the final URL. Fixed one test that needed _validate_image_url mocked to bypass DNS resolution on the fake blocked.test domain (is_safe_url does DNS checks that were added after the original PR). Co-authored-by: GutSlabs <GutSlabs@users.noreply.github.com>
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NousResearch#1940) (NousResearch#3845) Three safety gaps in vision_analyze_tool: 1. Local files accepted without checking if they're actually images — a renamed text file would get base64-encoded and sent to the model. Now validates magic bytes (PNG, JPEG, GIF, BMP, WebP, SVG). 2. No website policy enforcement on image URLs — blocked domains could be fetched via the vision tool. Now checks before download. 3. No redirect check — if an allowed URL redirected to a blocked domain, the download would proceed. Now re-checks the final URL. Fixed one test that needed _validate_image_url mocked to bypass DNS resolution on the fake blocked.test domain (is_safe_url does DNS checks that were added after the original PR). Co-authored-by: GutSlabs <GutSlabs@users.noreply.github.com>
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NousResearch#1940) (NousResearch#3845) Three safety gaps in vision_analyze_tool: 1. Local files accepted without checking if they're actually images — a renamed text file would get base64-encoded and sent to the model. Now validates magic bytes (PNG, JPEG, GIF, BMP, WebP, SVG). 2. No website policy enforcement on image URLs — blocked domains could be fetched via the vision tool. Now checks before download. 3. No redirect check — if an allowed URL redirected to a blocked domain, the download would proceed. Now re-checks the final URL. Fixed one test that needed _validate_image_url mocked to bypass DNS resolution on the fake blocked.test domain (is_safe_url does DNS checks that were added after the original PR). Co-authored-by: GutSlabs <GutSlabs@users.noreply.github.com>
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NousResearch#1940) (NousResearch#3845) Three safety gaps in vision_analyze_tool: 1. Local files accepted without checking if they're actually images — a renamed text file would get base64-encoded and sent to the model. Now validates magic bytes (PNG, JPEG, GIF, BMP, WebP, SVG). 2. No website policy enforcement on image URLs — blocked domains could be fetched via the vision tool. Now checks before download. 3. No redirect check — if an allowed URL redirected to a blocked domain, the download would proceed. Now re-checks the final URL. Fixed one test that needed _validate_image_url mocked to bypass DNS resolution on the fake blocked.test domain (is_safe_url does DNS checks that were added after the original PR). Co-authored-by: GutSlabs <GutSlabs@users.noreply.github.com>
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Salvage of #1940 by @Gutslabs. Cherry-picked cleanly with one test fix.
Gaps fixed
secret.txtrenamed to.pngwould be sent to modelcheck_website_accessin vision tool — blocked domains fetched freelyTest fix
One test needed
_validate_image_urlmocked — current main addedis_safe_urlDNS resolution checks that reject the fakeblocked.testdomain before the website policy check runs. The original PR predates that addition.Tests
6967 passed, 11 pre-existing failures, 0 regressions.