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chore(security): harden file endpoints (CSP+XFO) #67

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Merged
thewilloftheshadow merged 1 commit into from
Jan 29, 2026
Merged

chore(security): harden file endpoints (CSP+XFO) #67

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22 changes: 18 additions & 4 deletions convex/httpApiV1.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -375,7 +375,10 @@ async function skillsGetRouterV1Handler(ctx: ActionCtx, request: Request) {
if (!blob) return text('File missing in storage', 410, rate.headers)
const textContent = await blob.text()

const isSvg = file.contentType?.toLowerCase().includes('svg')
const isSvg =
file.contentType?.toLowerCase().includes('svg') ||
file.path.toLowerCase().endsWith('.svg')

const headers = mergeHeaders(rate.headers, {
'Content-Type': file.contentType
? `${file.contentType}; charset=utf-8`
Expand All @@ -385,7 +388,11 @@ async function skillsGetRouterV1Handler(ctx: ActionCtx, request: Request) {
'X-Content-SHA256': file.sha256,
'X-Content-Size': String(file.size),
'X-Content-Type-Options': 'nosniff',
'Content-Security-Policy': "default-src 'none'; style-src 'unsafe-inline'; img-src * data:; media-src *",
'X-Frame-Options': 'DENY',
// For any text response that a browser might try to render, lock it down.
// In particular, this prevents SVG <foreignObject> script execution from
// reading localStorage tokens on this origin.
'Content-Security-Policy': "default-src 'none'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'",
...(isSvg ? { 'Content-Disposition': 'attachment' } : {}),
})
return new Response(textContent, { status: 200, headers })
Expand Down Expand Up @@ -988,7 +995,10 @@ async function soulsGetRouterV1Handler(ctx: ActionCtx, request: Request) {

void ctx.runMutation(api.soulDownloads.increment, { soulId: soulResult.soul._id })

const isSvg = file.contentType?.toLowerCase().includes('svg')
const isSvg =
file.contentType?.toLowerCase().includes('svg') ||
file.path.toLowerCase().endsWith('.svg')

const headers = mergeHeaders(rate.headers, {
'Content-Type': file.contentType
? `${file.contentType}; charset=utf-8`
Expand All @@ -998,7 +1008,11 @@ async function soulsGetRouterV1Handler(ctx: ActionCtx, request: Request) {
'X-Content-SHA256': file.sha256,
'X-Content-Size': String(file.size),
'X-Content-Type-Options': 'nosniff',
'Content-Security-Policy': "default-src 'none'; style-src 'unsafe-inline'; img-src * data:; media-src *",
'X-Frame-Options': 'DENY',
// For any text response that a browser might try to render, lock it down.
// In particular, this prevents SVG <foreignObject> script execution from
// reading localStorage tokens on this origin.
'Content-Security-Policy': "default-src 'none'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'",
...(isSvg ? { 'Content-Disposition': 'attachment' } : {}),
})
return new Response(textContent, { status: 200, headers })
Expand Down
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