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get OLAT token lazily when first needed, not upon instantiation

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This commit is contained in:
Carol Alexandru 2021-07-30 14:19:53 +02:00
parent 59da4bcf4e
commit 0029cd4ec3
1 changed files with 18 additions and 12 deletions
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30
src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/olat/OlatLmsRestTemplate.java
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@ -34,25 +34,26 @@ public class OlatLmsRestTemplate extends RestTemplate {
public OlatLmsRestTemplate(ClientCredentialsResourceDetails details) {
super();
this.details = details;
authenticate();
// Add X-OLAT-TOKEN request header to every request done using this RestTemplate
this.getInterceptors().add(new ClientHttpRequestInterceptor(){
@Override
public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
request.getHeaders().set("accept", "application/json");
// if we don't have a token (this is normal during authentication), just do the call
if (token == null) { return execution.execute(request, body); }
// if there's no token, authenticate first
if (token == null) { authenticate(); }
// when authenticating, just do a normal call
else if (token == "authenticating") { return execution.execute(request, body); }
// otherwise, add the X-OLAT-TOKEN
request.getHeaders().set("accept", "application/json");
request.getHeaders().set("X-OLAT-TOKEN", token);
ClientHttpResponse response = execution.execute(request, body);
log.debug("OLAT [regular API call] Response Headers: {}", response.getHeaders());
log.debug("OLAT [regular API call] {} Headers: {}", response.getStatusCode(), response.getHeaders());
// If we get a 401, re-authenticate and try once more
if (response.getStatusCode() == HttpStatus.UNAUTHORIZED) {
authenticate();
request.getHeaders().set("X-OLAT-TOKEN", token);
response = execution.execute(request, body);
log.debug("OLAT [retry API call] Response Headers: {}", response.getHeaders());
log.debug("OLAT [retry API call] {} Headers: {}", response.getStatusCode(), response.getHeaders());
}
return response;
}
@ -61,16 +62,21 @@ public class OlatLmsRestTemplate extends RestTemplate {
private void authenticate() {
// Authenticate with OLAT and store the received X-OLAT-TOKEN
token = null;
token = "authenticating";
final String authUrl = String.format("%s%s?password=%s",
details.getAccessTokenUri(),
details.getClientId(),
details.getClientSecret());
final HttpHeaders httpHeaders = new HttpHeaders();
ResponseEntity<String> response = this.getForEntity(authUrl, String.class);
HttpHeaders responseHeaders = response.getHeaders();
log.debug("OLAT [authenticate] Response Headers: {}", responseHeaders);
token = responseHeaders.getFirst("X-OLAT-TOKEN");
try {
ResponseEntity<String> response = this.getForEntity(authUrl, String.class);
HttpHeaders responseHeaders = response.getHeaders();
log.debug("OLAT [authenticate] {} Headers: {}", response.getStatusCode(), responseHeaders);
token = responseHeaders.getFirst("X-OLAT-TOKEN");
}
catch (Exception e) {
token = null;
throw e;
}
}