Can't send plus('+') symbol as %2B to search by user key like someus+erkey

[Max Rud]

I use java and atlassian-connect-spring-boot and I need to send request to 

/rest/api/2/user?key={user.key}

User key is usually a part of email someus+erkey@gmail.com. And emails allow using plus sign in them. The problem is that I can't use this code to send valid request.

return atlassianHostRestClients.authenticatedAsAddon().getForObject("/rest/api/2/user?key={0}", UserModel.class, "someus+erkey")

It seems that AtlassianConnectHttpRequestInterceptor decode someus%2Berkey and send it like someus+erkey. I'm getting org.springframework.web.client.HttpClientErrorException: 404 Not Found.

Is there any way to send request with encoded plus symbol with atlassian-connect-spring-boot?

[Max Rud · Accepted solution]

To solve the problem, I used the following solution:

protected <T> ResponseEntity<T> sendCustomGet(String path, MultiValueMap<String, String> valueMap, Class<T> type) {
    String baseUrl = getHostFromSecurityContext().map(AtlassianHost::getBaseUrl).orElse("");
    MultiValueMap<String, String> encodedValueMap = new LinkedMultiValueMap<>();
    valueMap.forEach((k, l) -> {
        List<String> encodedValueList = new ArrayList<>();
        l.forEach(v -> {
            try {
                encodedValueList.add(URLEncoder.encode(v, "UTF-8"));
            } catch (UnsupportedEncodingException e) {                
                encodedValueList.add(v);
            }
        });
        encodedValueMap.put(k, encodedValueList);
    });

    URI uri = UriComponentsBuilder.fromUriString(baseUrl).path(path)
            .queryParams(encodedValueMap).build(true).toUri();

    String token = atlassianHostRestClients.createJwt(HttpMethod.GET, uri);
    HttpHeaders headers = new HttpHeaders();
    headers.set("Authorization", "JWT " + token);
    RestTemplate template = new RestTemplate();

    return template.exchange(uri, HttpMethod.GET, new HttpEntity<String>(headers), type);
}

 1. Get baseUrl from context

Optional.ofNullable(SecurityContextHolder.getContext().getAuthentication())
        .map(Authentication::getPrincipal)
        .filter(AtlassianHostUser.class::isInstance)
        .map(AtlassianHostUser.class::cast);

 2. Manually encode query parameters.

 3. Build URI with build(true).

 4. Generate JWT token atlassianHostRestClients.createJwt(HttpMethod.GET, uri) and add it to headers.

 5. Send request with template.exchange method.