feat: Pretty print GA4GH in consent

perun-oidc-server/src/main/java/cz/muni/ics/oidc/server/ga4gh/Ga4ghConsentUtils.java

+package cz.muni.ics.oidc.server.ga4gh;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nimbusds.jose.Payload;
+import com.nimbusds.jwt.JWTParser;
+import com.nimbusds.jwt.SignedJWT;
+import lombok.extern.slf4j.Slf4j;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
+@Slf4j
+public class Ga4ghConsentUtils {
+
+    public static class PassportVisa {
+        private final String jwt;
+        private String prettyPayload;
+        private String sub;
+        private String iss;
+        private String type;
+        private String value;
+
+        public PassportVisa(String jwt) {
+            this.jwt = jwt;
+        }
+
+        public String getJwt() {
+            return jwt;
+        }
+
+        void setPrettyPayload(String prettyPayload) {
+            this.prettyPayload = prettyPayload;
+        }
+
+        public String getPrettyString() {
+            return prettyPayload;
+        }
+
+        @Override
+        public String toString() {
+            return "PassportVisa{" +
+                    "  type=" + type +
+                    ", sub=" + sub +
+                    ", iss=" + iss +
+                    ", value=" + value +
+                    '}';
+        }
+
+        public void setSub(String sub) {
+            this.sub = sub;
+        }
+
+        public String getSub() {
+            return sub;
+        }
+
+        public void setIss(String iss) {
+            this.iss = iss;
+        }
+
+        public String getIss() {
+            return iss;
+        }
+
+        public void setType(String type) {
+            this.type = type;
+        }
+
+        public String getType() {
+            return type;
+        }
+
+        public void setValue(String value) {
+            this.value = value;
+        }
+
+        public String getValue() {
+            return value;
+        }
+    }
+
+    public static PassportVisa parseAndVerifyVisa(String jwtString) {
+        PassportVisa visa = new PassportVisa(jwtString);
+        try {
+            SignedJWT signedJWT = (SignedJWT) JWTParser.parse(jwtString);
+            processPayload(visa, signedJWT.getPayload());
+        } catch (Exception ex) {
+            log.error("visa " + jwtString + " cannot be parsed and verified", ex);
+        }
+        return visa;
+    }
+
+    private static final ObjectMapper JSON_MAPPER = new ObjectMapper();
+
+    private static void processPayload(PassportVisa visa, Payload payload) throws IOException {
+        JsonNode doc = JSON_MAPPER.readValue(payload.toString(), JsonNode.class);
+        checkVisaKey(visa, doc, "sub");
+        checkVisaKey(visa, doc, "exp");
+        checkVisaKey(visa, doc, "iss");
+        JsonNode visaV1 = doc.path("ga4gh_visa_v1");
+        checkVisaKey(visa, visaV1, "type");
+        checkVisaKey(visa, visaV1, "asserted");
+        checkVisaKey(visa, visaV1, "value");
+        checkVisaKey(visa, visaV1, "source");
+        checkVisaKey(visa, visaV1, "by");
+        long exp = doc.get("exp").asLong();
+        if (exp < Instant.now().getEpochSecond()) {
+            return;
+        }
+        visa.setPrettyPayload(
+                visaV1.get("type").asText() + ":  \"" + visaV1.get("value").asText() + "\" asserted " + isoDate(visaV1.get("asserted").asLong())
+        );
+    }
+
+    private static void checkVisaKey(PassportVisa visa, JsonNode jsonNode, String key) {
+        if (!jsonNode.path(key).isMissingNode()) {
+            switch (key) {
+                case "sub":
+                    visa.setSub(jsonNode.path(key).asText());
+                    break;
+                case "iss":
+                    visa.setIss(jsonNode.path(key).asText());
+                    break;
+                case "type":
+                    visa.setType(jsonNode.path(key).asText());
+                    break;
+                case "value":
+                    visa.setValue(jsonNode.path(key).asText());
+                    break;
+                default:
+            }
+        }
+    }
+
+    private static String isoDate(long linuxTime) {
+        return DateTimeFormatter.ISO_LOCAL_DATE.format(ZonedDateTime.ofInstant(Instant.ofEpochSecond(linuxTime), ZoneId.systemDefault()));
+    }
+
+}