wehub-resource-sync
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
package middleware
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import (
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"net/http"
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"strings"
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"github.com/github/github-mcp-server/pkg/http/headers"
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)
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// SetCorsHeaders is middleware that sets CORS headers to allow browser-based
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// MCP clients to connect from any origin. This is safe because the server
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// authenticates via bearer tokens (not cookies), so cross-origin requests
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// cannot exploit ambient credentials.
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func SetCorsHeaders(h http.Handler) http.Handler {
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allowHeaders := strings.Join([]string{
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"Content-Type",
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"Mcp-Session-Id",
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"Mcp-Protocol-Version",
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"Last-Event-ID",
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headers.AuthorizationHeader,
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headers.MCPReadOnlyHeader,
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headers.MCPToolsetsHeader,
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headers.MCPToolsHeader,
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headers.MCPExcludeToolsHeader,
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headers.MCPFeaturesHeader,
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headers.MCPLockdownHeader,
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headers.MCPInsidersHeader,
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}, ", ")
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Access-Control-Allow-Origin", "*")
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w.Header().Set("Access-Control-Allow-Methods", "GET, POST, DELETE, OPTIONS")
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w.Header().Set("Access-Control-Max-Age", "86400")
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w.Header().Set("Access-Control-Expose-Headers", "Mcp-Session-Id, WWW-Authenticate")
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w.Header().Set("Access-Control-Allow-Headers", allowHeaders)
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if r.Method == http.MethodOptions {
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w.WriteHeader(http.StatusOK)
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return
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}
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h.ServeHTTP(w, r)
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})
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}
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