50 lines
1005 B
Go
50 lines
1005 B
Go
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package main
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import (
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"encoding/pem"
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"fmt"
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"io"
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"log"
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"os"
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"github.com/lestrrat-go/jwx/v2/jwk"
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)
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func main() {
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// Read the JWK from standard input.
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jwkBytes, err := io.ReadAll(os.Stdin)
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if err != nil {
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log.Fatalf("failed to read from stdin: %s", err)
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}
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// Parse the JWK.
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key, err := jwk.ParseKey(jwkBytes)
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if err != nil {
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log.Fatalf("failed to parse JWK: %s", err)
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}
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// Get the public key.
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var rawPublicKey interface{}
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if err := key.Raw(&rawPublicKey); err != nil {
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log.Fatalf("failed to get raw public key: %s", err)
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}
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// Encode the public key to PEM format. [4]
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pemBytes, err := jwk.EncodePEM(key)
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if err != nil {
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log.Fatalf("failed to encode public key to PEM: %s", err)
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}
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// Write the PEM encoded public key to standard output.
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block, _ := pem.Decode(pemBytes)
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if block == nil {
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log.Fatal("failed to decode PEM block")
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}
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if err := pem.Encode(os.Stdout, block); err != nil {
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log.Fatalf("failed to write PEM block to stdout: %s", err)
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}
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fmt.Println()
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}
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