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Code Issues Packages Projects Releases Wiki Activity

Added schema.org templates

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M66B
2023-12-01 11:37:14 +01:00
parent d818c6b592
commit 0fdeeda070
6 changed files with 147 additions and 22 deletions
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140
app/src/main/java/eu/faircode/email/JsonLd.java
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@@ -20,6 +20,13 @@ package eu.faircode.email;
*/
import android.content.Context;
import android.text.TextUtils;
import androidx.annotation.NonNull;
import com.jayway.jsonpath.Configuration;
import com.jayway.jsonpath.JsonPath;
import com.jayway.jsonpath.PathNotFoundException;
import org.json.JSONArray;
import org.json.JSONException;
@@ -27,7 +34,12 @@ import org.json.JSONObject;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
// https://json-ld.org/
// https://schema.org/
@@ -38,11 +50,15 @@ public class JsonLd {
private Object jroot;
private Throwable error = null;
private static final String URI_SCHEMA_ORG = "https://schema.org/";
private static final String URI_SCHEMA_ORG = "https://schema.org";
private static final String PLACEHOLDER_START = "<!--";
private static final String PLACEHOLDER_END = "-->";
public JsonLd(String json) {
try {
if (json != null && json.trim().startsWith("["))
if (TextUtils.isEmpty(json))
jroot = null;
else if (json.trim().startsWith("["))
jroot = new JSONArray(json);
else
jroot = new JSONObject(json);
@@ -52,23 +68,112 @@ public class JsonLd {
}
}
private String getTemplate(Context context, JSONObject jobject) {
try {
if (!jobject.has("@context") || jobject.isNull("@context"))
return null;
if (!jobject.has("@type") || jobject.isNull("@type"))
return null;
String jcontext = jobject.getString("@context");
String jtype = jobject.getString("@type");
Log.i("JSON-LD template " + jcontext + "=" + jtype);
if (!URI_SCHEMA_ORG.equals(jcontext) &&
!"http://schema.org".equals(jcontext)) {
Log.e("JSON-LD " + jcontext + "?=" + jtype);
return null;
}
// https://github.com/json-path/JsonPath
Configuration conf = Configuration.defaultConfiguration();
Object document = conf.jsonProvider().parse(jobject.toString());
String name = "schema.org/" + jtype.toLowerCase(Locale.ROOT) + ".html";
Log.i("JSON-LD using=" + name);
String template;
try (InputStream is = context.getAssets().open(name)) {
template = Helper.readStream(is);
} catch (FileNotFoundException ex) {
Log.e("JSON-LD " + jcontext + "=" + jtype + "?");
throw ex;
}
int start = template.indexOf(PLACEHOLDER_START);
while (start >= 0) {
int end = template.indexOf(PLACEHOLDER_END, start + PLACEHOLDER_START.length());
if (end < 0)
throw new IllegalArgumentException("Missing placeholder end @" + start);
String placeholder = template.substring(start + PLACEHOLDER_START.length(), end).trim();
String value;
try {
value = JsonPath.read(document, placeholder);
if (value == null)
value = "";
if (value.startsWith(URI_SCHEMA_ORG + "/"))
value = unCamelCase(value.substring(URI_SCHEMA_ORG.length() + 1));
} catch (PathNotFoundException ex) {
Log.i(ex);
value = "";
}
Log.i("JSON-LD " + placeholder + "=" + value);
template = template.substring(0, start) + value + template.substring(end + PLACEHOLDER_END.length());
start = template.indexOf(PLACEHOLDER_START);
}
return template;
} catch (Throwable ex) {
Log.w("JSON-LD", ex);
return null;
}
}
public String getHtml(Context context) {
try {
if (error != null)
throw error;
if (jroot == null)
throw new IllegalArgumentException("JSON-LD empty");
Document d = Document.createShell("");
d.body().appendElement("hr");
d.body().appendElement("div")
.attr("style", "font-family: monospace;")
.appendElement("a")
.attr("style", "font-size: larger !important;")
.attr("href", "https://json-ld.org/")
.text("Linked data");
d.body().appendElement("br");
List<JSONObject> jschemas = new ArrayList<>();
if (jroot instanceof JSONObject)
jschemas.add((JSONObject) jroot);
else if (jroot instanceof JSONArray) {
JSONArray jarray = (JSONArray) jroot;
for (int i = 0; i < jarray.length(); i++)
jschemas.add((JSONObject) jarray.get(i));
}
for (JSONObject jschema : jschemas) {
String template = getTemplate(context, jschema);
if (template != null) {
d.body().appendElement("div").append(template);
d.body().append("<br>");
}
}
Element holder = d.body().appendElement("div")
.attr("style",
"font-family: monospace; font-size: smaller !important;");
getHtml(jroot, 0, holder);
for (int i = 0; i < jschemas.size(); i++) {
if (i > 0)
holder.appendElement("br");
getHtml(context, jschemas.get(i), 0, holder);
}
d.body().appendElement("hr");
return d.body().html();
} catch (Throwable ex) {
@@ -79,18 +184,10 @@ public class JsonLd {
}
}
private void getHtml(Object obj, int indent, Element holder) throws JSONException {
private void getHtml(Context context, Object obj, int indent, Element holder) throws JSONException {
if (obj instanceof JSONObject) {
JSONObject jobject = (JSONObject) obj;
if (indent == 0 &&
jobject.has("@context") &&
jobject.has("@type")) {
String context = (jobject.isNull("@context") ? null : jobject.optString("@context"));
String type = (jobject.isNull("@type") ? null : jobject.optString("@type"));
Log.e("JSON-LD " + context + "=" + type);
}
Iterator<String> keys = jobject.keys();
while (keys.hasNext()) {
String key = keys.next();
@@ -104,22 +201,19 @@ public class JsonLd {
if (v instanceof JSONObject || v instanceof JSONArray) {
holder.appendElement("br");
getHtml(v, indent + 1, holder);
getHtml(context, v, indent + 1, holder);
} else {
String _v = v.toString();
if (_v.startsWith(URI_SCHEMA_ORG))
_v = unCamelCase(_v.substring(URI_SCHEMA_ORG.length()));
if (_v.startsWith(URI_SCHEMA_ORG + "/"))
_v = unCamelCase(_v.substring(URI_SCHEMA_ORG.length() + 1));
holder.appendElement("span").text(_v);
holder.appendElement("br");
}
}
} else if (obj instanceof JSONArray) {
JSONArray jarray = (JSONArray) obj;
for (int i = 0; i < jarray.length(); i++) {
if (indent == 0 && i > 0)
holder.appendElement("br");
getHtml(jarray.get(i), indent, holder);
}
for (int i = 0; i < jarray.length(); i++)
getHtml(context, jarray.get(i), indent, holder);
} else {
indent(indent, holder);
String v = (obj == null ? "" : obj.toString());
@@ -138,7 +232,9 @@ public class JsonLd {
sb.append(kar);
else {
split = true;
sb.append(' ').append(Character.toLowerCase(kar));
if (i > 0)
kar = Character.toLowerCase(kar);
sb.append(' ').append(kar);
}
} else {
split = false;