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use percent_encoding::percent_decode;
use std::collections::HashMap;
use std::future::Future;
use std::pin::Pin;
use std::str::FromStr;
use std::task::{Context, Poll};
use didkit::resolve_key;
use didkit::{
dereference as dereference_did_url, Content, ContentMetadata, CredentialOrJWT, DIDResolver,
DereferencingInputMetadata, JWTOrLDPOptions, LinkedDataProofOptions, ProofFormat,
ResolutionResult, VerifiableCredential, VerifiablePresentation, VerificationResult, JWK,
};
use didkit_cli::opts::ResolverOptions;
use ssi::did_resolve::{
ERROR_INVALID_DID, ERROR_NOT_FOUND, ERROR_REPRESENTATION_NOT_SUPPORTED, TYPE_DID_LD_JSON,
TYPE_DID_RESOLUTION,
};
pub mod accept;
pub mod error;
use accept::HttpAccept;
pub use error::Error;
use hyper::header::{ACCEPT, CONTENT_TYPE, LOCATION};
use hyper::{Body, Response};
use hyper::{Method, Request, StatusCode};
use serde::{Deserialize, Serialize};
use serde_json::json;
use tower_service::Service;
pub const MAX_BODY_LENGTH: usize = 2097152;
#[derive(Debug, Serialize, Deserialize, Clone)]
#[serde(untagged)]
pub enum PresentationOrJWT {
VP(VerifiablePresentation),
JWT(String),
}
#[derive(Debug, Serialize, Deserialize, Clone)]
#[serde(rename_all = "camelCase")]
#[serde(deny_unknown_fields)]
pub struct IssueCredentialRequest {
pub credential: VerifiableCredential,
pub options: Option<JWTOrLDPOptions>,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
#[serde(rename_all = "camelCase")]
#[serde(deny_unknown_fields)]
pub struct VerifyCredentialRequest {
pub verifiable_credential: CredentialOrJWT,
pub options: Option<JWTOrLDPOptions>,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
#[serde(rename_all = "camelCase")]
#[serde(deny_unknown_fields)]
pub struct ProvePresentationRequest {
pub presentation: VerifiablePresentation,
pub options: Option<JWTOrLDPOptions>,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
#[serde(rename_all = "camelCase")]
#[serde(deny_unknown_fields)]
pub struct VerifyPresentationRequest {
pub verifiable_presentation: PresentationOrJWT,
pub options: Option<JWTOrLDPOptions>,
}
pub type IssueCredentialResponse = VerifiableCredential;
pub type VerifyCredentialResponse = VerificationResult;
pub type ProvePresentationResponse = VerifiablePresentation;
pub type VerifyPresentationResponse = VerificationResult;
type KeyMap = HashMap<JWK, JWK>;
pub struct DIDKitHTTPSvc {
keys: KeyMap,
resolver_options: ResolverOptions,
}
pub async fn pick_key<'a>(
keys: &'a KeyMap,
options: &LinkedDataProofOptions,
did_resolver: &dyn DIDResolver,
) -> Option<&'a JWK> {
if keys.len() <= 1 {
return keys.values().next();
}
let vm = match options.verification_method {
Some(ref verification_method) => verification_method.to_string(),
None => return keys.values().next(),
};
let public_key = match resolve_key(&vm, did_resolver).await {
Err(_err) => {
return None;
}
Ok(key) => key,
};
keys.get(&public_key)
}
async fn get_body_bytes_limited(req: Request<Body>) -> Result<Vec<u8>, (StatusCode, String)> {
use hyper::body::HttpBody;
let mut body = req.into_body();
let mut bytes = Vec::new();
while let Some(buf) = body.data().await {
let buf = match buf {
Ok(buf) => buf,
Err(err) => {
return Err((StatusCode::INTERNAL_SERVER_ERROR, err.to_string()));
}
};
if bytes.len() + buf.len() > MAX_BODY_LENGTH {
return Err((
StatusCode::PAYLOAD_TOO_LARGE,
"Request too large".to_string(),
));
}
bytes.append(&mut buf.to_vec());
}
Ok(bytes)
}
impl DIDKitHTTPSvc {
pub fn new(keys: KeyMap, resolver_options: ResolverOptions) -> Self {
Self {
keys,
resolver_options,
}
}
pub fn response(
status_code: StatusCode,
text: String,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
Box::pin(async move {
let value = json!(text);
let body = Body::from(serde_json::to_vec_pretty(&value)?);
Response::builder()
.status(status_code)
.header(CONTENT_TYPE, "application/json")
.body(body)
.map_err(|err| err.into())
})
}
pub fn ensure_json(
&self,
req: &Request<Body>,
) -> Option<Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>>> {
if let Some(content_type) = req.headers().get(CONTENT_TYPE) {
if content_type != "application/json" {
return Some(Self::response(
StatusCode::BAD_REQUEST,
"Expected application/json".to_string(),
));
}
}
None
}
pub fn ensure_accept_json(
&self,
req: &Request<Body>,
) -> Option<Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>>> {
let accept = match req.headers().get(ACCEPT) {
Some(accept) => accept,
None => return None,
};
let accept = match match accept.to_str() {
Ok(accept) => HttpAccept::from_str(accept),
Err(err) => Err(err.into()),
} {
Ok(accept) => accept,
Err(err) => {
return Some(Self::response(
StatusCode::BAD_REQUEST,
"Unable to parse Accept header: ".to_string() + &err.to_string(),
))
}
};
if accept.can_accept("application/json") {
return None;
}
return Some(Self::response(
StatusCode::NOT_ACCEPTABLE,
"Response can only be application/json".to_string(),
));
}
pub fn method_not_allowed(
&self,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
Self::response(
StatusCode::METHOD_NOT_ALLOWED,
"Method not allowed".to_string(),
)
}
pub fn not_found(&self) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
Self::response(StatusCode::NOT_FOUND, "Not found".to_owned())
}
pub fn missing_key() -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
Self::response(StatusCode::INTERNAL_SERVER_ERROR, "Missing key".to_string())
}
pub fn issue_credentials(
&self,
req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
if req.method() != Method::POST {
return self.method_not_allowed();
}
if let Some(resp) = self.ensure_json(&req) {
return resp;
};
if let Some(resp) = self.ensure_accept_json(&req) {
return resp;
};
let keys = self.keys.clone();
let resolver_options = self.resolver_options.clone();
Box::pin(async move {
let bytes = match get_body_bytes_limited(req).await {
Ok(bytes) => bytes,
Err((status_code, message)) => {
return Self::response(status_code, message).await;
}
};
let issue_req: IssueCredentialRequest = match serde_json::from_slice(&bytes) {
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
let options = issue_req.options.unwrap_or_default();
let proof_format = options.proof_format.unwrap_or_default();
let resolver = resolver_options.to_resolver();
let key = match pick_key(&keys, &options.ldp_options, &resolver).await {
Some(key) => key,
None => return Self::missing_key().await,
};
let mut credential = issue_req.credential;
let body = match proof_format {
ProofFormat::JWT => {
let jwt = match credential
.generate_jwt(Some(&key), &options.ldp_options, &resolver)
.await
{
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
Body::from(jwt.into_bytes())
}
ProofFormat::LDP => {
let proof = match credential
.generate_proof(key, &options.ldp_options, &resolver)
.await
{
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
credential.add_proof(proof);
Body::from(serde_json::to_vec_pretty(&credential)?)
}
_ => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unknown proof format: {}", proof_format),
)
.await;
}
};
Response::builder()
.status(StatusCode::CREATED)
.header(CONTENT_TYPE, "application/json")
.body(body)
.map_err(|err| err.into())
})
}
pub fn verify_credentials(
&self,
req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
if req.method() != Method::POST {
return self.method_not_allowed();
}
if let Some(resp) = self.ensure_json(&req) {
return resp;
};
if let Some(resp) = self.ensure_accept_json(&req) {
return resp;
};
let resolver_options = self.resolver_options.clone();
Box::pin(async move {
let bytes = match get_body_bytes_limited(req).await {
Ok(bytes) => bytes,
Err((status_code, message)) => {
return Self::response(status_code, message).await;
}
};
let verify_req: VerifyCredentialRequest = match serde_json::from_slice(&bytes) {
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
let resolver = resolver_options.to_resolver();
let options = verify_req.options.unwrap_or_default();
let ldp_options = options.ldp_options;
let result = match (options.proof_format, verify_req.verifiable_credential) {
(Some(ProofFormat::LDP), CredentialOrJWT::Credential(vc))
| (None, CredentialOrJWT::Credential(vc)) => {
vc.verify(Some(ldp_options), &resolver).await
}
(Some(ProofFormat::JWT), CredentialOrJWT::JWT(vc_jwt))
| (None, CredentialOrJWT::JWT(vc_jwt)) => {
VerifiableCredential::verify_jwt(&vc_jwt, Some(ldp_options), &resolver).await
}
(Some(proof_format), vc) => {
let err_msg = format!(
"Credential/proof format mismatch. Proof format: {}, credential: {}",
proof_format,
serde_json::to_string(&vc)?
);
return Self::response(StatusCode::BAD_REQUEST, err_msg).await;
}
};
let body = Body::from(serde_json::to_vec_pretty(&result)?);
Response::builder()
.status(match result.errors.is_empty() {
true => StatusCode::OK,
false => StatusCode::BAD_REQUEST,
})
.header(CONTENT_TYPE, "application/json")
.body(body)
.map_err(|err| err.into())
})
}
pub fn prove_presentations(
&self,
req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
if req.method() != Method::POST {
return self.method_not_allowed();
}
if let Some(resp) = self.ensure_json(&req) {
return resp;
};
if let Some(resp) = self.ensure_accept_json(&req) {
return resp;
};
let keys = self.keys.clone();
let resolver_options = self.resolver_options.clone();
Box::pin(async move {
let bytes = match get_body_bytes_limited(req).await {
Ok(bytes) => bytes,
Err((status_code, message)) => {
return Self::response(status_code, message).await;
}
};
let issue_req: ProvePresentationRequest = match serde_json::from_slice(&bytes) {
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
let options = issue_req
.options
.unwrap_or_else(JWTOrLDPOptions::default_for_vp);
let mut presentation = issue_req.presentation;
let proof_format = options.proof_format.unwrap_or_default();
let ldp_options = options.ldp_options;
let resolver = resolver_options.to_resolver();
let key = match pick_key(&keys, &ldp_options, &resolver).await {
Some(key) => key,
None => return Self::missing_key().await,
};
let body = match proof_format {
ProofFormat::JWT => {
let jwt = match presentation
.generate_jwt(Some(&key), &ldp_options, &resolver)
.await
{
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
Body::from(jwt.into_bytes())
}
ProofFormat::LDP => {
let proof = match presentation
.generate_proof(key, &ldp_options, &resolver)
.await
{
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
presentation.add_proof(proof);
Body::from(serde_json::to_vec_pretty(&presentation)?)
}
_ => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unknown proof format: {}", proof_format),
)
.await;
}
};
Response::builder()
.status(StatusCode::CREATED)
.header(CONTENT_TYPE, "application/json")
.body(body)
.map_err(|err| err.into())
})
}
pub fn verify_presentations(
&self,
req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
if req.method() != Method::POST {
return self.method_not_allowed();
}
if let Some(resp) = self.ensure_json(&req) {
return resp;
};
if let Some(resp) = self.ensure_accept_json(&req) {
return resp;
};
let resolver_options = self.resolver_options.clone();
Box::pin(async move {
let bytes = match get_body_bytes_limited(req).await {
Ok(bytes) => bytes,
Err((status_code, message)) => {
return Self::response(status_code, message).await;
}
};
let verify_req: VerifyPresentationRequest = match serde_json::from_slice(&bytes) {
Ok(reader) => reader,
Err(err) => {
return Self::response(StatusCode::BAD_REQUEST, err.to_string()).await;
}
};
let resolver = resolver_options.to_resolver();
let options = verify_req
.options
.unwrap_or_else(JWTOrLDPOptions::default_for_vp);
let ldp_options = options.ldp_options;
let result = match (options.proof_format, verify_req.verifiable_presentation) {
(Some(ProofFormat::LDP), PresentationOrJWT::VP(vp))
| (None, PresentationOrJWT::VP(vp)) => {
vp.verify(Some(ldp_options), &resolver).await
}
(Some(ProofFormat::JWT), PresentationOrJWT::JWT(vp_jwt))
| (None, PresentationOrJWT::JWT(vp_jwt)) => {
VerifiablePresentation::verify_jwt(&vp_jwt, Some(ldp_options), &resolver).await
}
(Some(proof_format), vp) => {
let err_msg = format!(
"Presentation/proof format mismatch. Proof format: {}, presentation: {}",
proof_format,
serde_json::to_string(&vp)?
);
return Self::response(StatusCode::BAD_REQUEST, err_msg).await;
}
};
let body = Body::from(serde_json::to_vec_pretty(&result)?);
Response::builder()
.header(CONTENT_TYPE, "application/json")
.status(match result.errors.is_empty() {
true => StatusCode::OK,
false => StatusCode::BAD_REQUEST,
})
.body(body)
.map_err(|err| err.into())
})
}
pub fn resolve_dereference(
&self,
req: Request<Body>,
) -> Pin<Box<dyn Future<Output = Result<Response<Body>, Error>> + Send>> {
if req.method() != Method::GET {
return self.method_not_allowed();
}
let uri = req.uri();
let mut deref_input_meta: DereferencingInputMetadata =
match serde_urlencoded::from_str(uri.query().unwrap_or("")) {
Ok(metadata) => metadata,
Err(err) => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unable to parse resolution input metadata: {}", err),
);
}
};
let http_accept = match req.headers().get(ACCEPT) {
Some(header) => match header.to_str() {
Ok(accept_str) => Some(accept_str.to_string()),
Err(err) => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unable to parse Accept header: {}", err),
);
}
},
None => None,
};
if deref_input_meta.accept.is_none() && http_accept.is_some() {
deref_input_meta.accept = http_accept;
};
let resolver_options = self.resolver_options.clone();
Box::pin(async move {
let uri = req.uri();
let path: String = uri.path().chars().skip(13).collect();
let did_url = match percent_decode(path.as_bytes()).decode_utf8() {
Ok(did_url) => did_url,
Err(err) => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unable to parse DID URL: {}", err),
)
.await;
}
};
let resolver = resolver_options.to_resolver();
let (deref_meta, content, content_meta) =
dereference_did_url(&resolver, &did_url, &deref_input_meta).await;
let (mut parts, mut body) = Response::<Body>::default().into_parts();
if let Some(ref error) = deref_meta.error {
parts.status = match &error[..] {
ERROR_NOT_FOUND => StatusCode::NOT_FOUND,
ERROR_INVALID_DID => StatusCode::BAD_REQUEST,
ERROR_REPRESENTATION_NOT_SUPPORTED => StatusCode::NOT_ACCEPTABLE,
_ => StatusCode::INTERNAL_SERVER_ERROR,
};
body = Body::from(error.as_bytes().to_vec());
}
if let ContentMetadata::DIDDocument(ref did_doc_meta) = content_meta {
if did_doc_meta.deactivated == Some(true) {
parts.status = StatusCode::GONE;
}
}
match content {
Content::DIDDocument(did_doc) => {
if deref_input_meta.accept != Some(TYPE_DID_RESOLUTION.to_string()) {
let content_type = deref_meta
.content_type
.unwrap_or_else(|| TYPE_DID_LD_JSON.to_string());
let content_type_header = match content_type.parse() {
Err(err) => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unable to parse Content-Type: {}", err),
)
.await;
}
Ok(content_type) => content_type,
};
parts.headers.insert(CONTENT_TYPE, content_type_header);
let representation = match did_doc.to_representation(&content_type) {
Err(err) => {
return Self::response(
StatusCode::NOT_ACCEPTABLE,
format!("Unable to represent DID document: {}", err),
)
.await;
}
Ok(content_type) => content_type,
};
body = Body::from(representation);
} else {
let did_doc_meta_opt = match content_meta {
ContentMetadata::DIDDocument(meta) => Some(meta),
ContentMetadata::Other(map) if map.is_empty() => None,
_ => {
return Self::response(
StatusCode::NOT_ACCEPTABLE,
format!(
"Expected content-metadata to be a DID Document metadata structure, but found: {:?}", content_meta
),
)
.await;
}
};
let result = ResolutionResult {
did_document: Some(did_doc),
did_resolution_metadata: Some(deref_meta.clone().into()),
did_document_metadata: did_doc_meta_opt,
..Default::default()
};
let content_type = match TYPE_DID_RESOLUTION.parse() {
Ok(content_type) => content_type,
Err(err) => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unable to parse Content-Type: {}", err),
)
.await;
}
};
parts.headers.insert(CONTENT_TYPE, content_type);
let result_data = match serde_json::to_vec(&result) {
Ok(data) => data,
Err(err) => {
return Self::response(
StatusCode::INTERNAL_SERVER_ERROR,
format!("Unable to serialize resolution result: {}", err),
)
.await;
}
};
body = Body::from(result_data);
}
}
Content::URL(url) => {
parts.status = StatusCode::SEE_OTHER;
let location = match url.parse() {
Ok(location) => location,
Err(err) => {
return Self::response(
StatusCode::BAD_REQUEST,
format!("Unable to parse service endpoint URL: {}", err),
)
.await;
}
};
parts.headers.insert(LOCATION, location);
}
Content::Object(object) => {
let object_data = match serde_json::to_vec(&object) {
Ok(data) => data,
Err(err) => {
return Self::response(
StatusCode::INTERNAL_SERVER_ERROR,
format!("Unable to serialize dereferenced object: {}", err),
)
.await;
}
};
body = Body::from(object_data);
}
Content::Data(data) => {
body = Body::from(data);
}
Content::Null => {}
};
let response = Response::from_parts(parts, body);
Ok(response)
})
}
}
impl Service<Request<Body>> for DIDKitHTTPSvc {
type Response = Response<Body>;
type Error = Error;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
fn poll_ready(&mut self, _: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, req: Request<Body>) -> Self::Future {
let path = req.uri().path();
match path {
"/issue/credentials" => return self.issue_credentials(req),
"/verify/credentials" => return self.verify_credentials(req),
"/prove/presentations" => return self.prove_presentations(req),
"/verify/presentations" => return self.verify_presentations(req),
"/credentials/issue" => return self.issue_credentials(req),
"/credentials/verify" => return self.verify_credentials(req),
"/credentials/prove" => return self.prove_presentations(req),
"/presentations/prove" => return self.prove_presentations(req),
"/presentations/verify" => return self.verify_presentations(req),
_ => {}
};
if path.starts_with("/identifiers/") {
return self.resolve_dereference(req);
}
self.not_found()
}
}
pub struct DIDKitHTTPMakeSvc {
keys: KeyMap,
resolver_options: ResolverOptions,
}
impl DIDKitHTTPMakeSvc {
pub fn new(keys: Vec<JWK>, resolver_options: ResolverOptions) -> Self {
Self {
keys: keys.into_iter().fold(KeyMap::new(), |mut map, key| {
map.insert(key.to_public(), key);
map
}),
resolver_options,
}
}
}
impl<T> Service<T> for DIDKitHTTPMakeSvc {
type Response = DIDKitHTTPSvc;
type Error = Error;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
fn poll_ready(&mut self, _: &mut Context) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, _: T) -> Self::Future {
let keys = self.keys.clone();
let resolver_options = self.resolver_options.clone();
let fut = async move { Ok(DIDKitHTTPSvc::new(keys, resolver_options)) };
Box::pin(fut)
}
}
