Migrate WolframAlpha command

.gitignore

@@ -145,6 +145,7 @@ gradle-app.setting
 # End of https://www.toptal.com/developers/gitignore/api/netbeans,intellij,java,gradle,eclipse
 application/db/
 config.json
+application/config.json
 *.db
 *.db-shm
 *.db-wal

application/build.gradle

@@ -48,12 +48,15 @@ dependencies {
 
     implementation 'org.jooq:jooq:3.15.3'
 
+    implementation 'io.mikael:urlbuilder:2.0.9'
+
     implementation 'org.scilab.forge:jlatexmath:1.0.7'
     implementation 'org.scilab.forge:jlatexmath-font-greek:1.0.7'
     implementation 'org.scilab.forge:jlatexmath-font-cyrillic:1.0.7'
 
     implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-csv:2.13.0'
     implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.13.0'
+    implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.13.0'
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.13.0'
 
 	implementation 'com.github.freva:ascii-table:1.2.0'

application/config.json.template

@@ -32,5 +32,6 @@
        "hostBlacklist": ["bit.ly"],
        "suspiciousHostKeywords": ["discord", "nitro", "premium"],
        "isHostSimilarToKeywordDistanceThreshold": 2
-   }
+   },
+   "wolframAlphaAppId": "79J52T-6239TVXHR7"
 }

application/src/main/java/org/togetherjava/tjbot/commands/Features.java

@@ -10,6 +10,7 @@
 import org.togetherjava.tjbot.commands.free.FreeChannelMonitor;
 import org.togetherjava.tjbot.commands.free.FreeCommand;
 import org.togetherjava.tjbot.commands.mathcommands.TeXCommand;
+import org.togetherjava.tjbot.commands.mathcommands.wolframalpha.WolframAlphaCommand;
 import org.togetherjava.tjbot.commands.moderation.*;
 import org.togetherjava.tjbot.commands.moderation.scam.ScamBlocker;
 import org.togetherjava.tjbot.commands.moderation.scam.ScamHistoryPurgeRoutine;
@@ -105,6 +106,7 @@ public enum Features {
         features.add(new QuarantineCommand(actionsStore, config));
         features.add(new UnquarantineCommand(actionsStore, config));
         features.add(new WhoIsCommand());
+        features.add(new WolframAlphaCommand(config));
 
         // Mixtures
         features.add(new FreeCommand(config, freeChannelMonitor));

application/src/main/java/org/togetherjava/tjbot/commands/mathcommands/wolframalpha/WolframAlphaCommand.java

@@ -0,0 +1,87 @@
+package org.togetherjava.tjbot.commands.mathcommands.wolframalpha;
+
+import io.mikael.urlbuilder.UrlBuilder;
+import net.dv8tion.jda.api.entities.Message;
+import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
+import net.dv8tion.jda.api.interactions.callbacks.IDeferrableCallback;
+import net.dv8tion.jda.api.interactions.commands.OptionType;
+import net.dv8tion.jda.api.requests.restaction.WebhookMessageUpdateAction;
+import org.jetbrains.annotations.NotNull;
+import org.togetherjava.tjbot.commands.SlashCommandAdapter;
+import org.togetherjava.tjbot.commands.SlashCommandVisibility;
+import org.togetherjava.tjbot.config.Config;
+
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Command to send a query to the <a href="https://www.wolframalpha.com/">Wolfram Alpha</a> API.
+ * Renders its response as images.
+ */
+public final class WolframAlphaCommand extends SlashCommandAdapter {
+    private static final String QUERY_OPTION = "query";
+    /**
+     * WolframAlpha API endpoint to connect to.
+     *
+     * @see <a href=
+     *      "https://products.wolframalpha.com/docs/WolframAlpha-API-Reference.pdf">WolframAlpha API
+     *      Reference</a>.
+     */
+    private static final String API_ENDPOINT = "http://api.wolframalpha.com/v2/query";
+    private static final HttpClient CLIENT = HttpClient.newHttpClient();
+
+    private final String appId;
+
+    /**
+     * Creates a new instance.
+     *
+     * @param config the config to use
+     */
+    public WolframAlphaCommand(@NotNull Config config) {
+        super("wolfram-alpha", "Renders mathematical queries using WolframAlpha",
+                SlashCommandVisibility.GUILD);
+        getData().addOption(OptionType.STRING, QUERY_OPTION, "the query to send to WolframAlpha",
+                true);
+        appId = config.getWolframAlphaAppId();
+    }
+
+    @Override
+    public void onSlashCommand(@NotNull SlashCommandInteractionEvent event) {
+        String query = event.getOption(QUERY_OPTION).getAsString();
+        WolframAlphaHandler handler = new WolframAlphaHandler(query);
+
+        // The API call takes a bit
+        event.deferReply().queue();
+
+        // Send query
+        HttpRequest request = HttpRequest
+            .newBuilder(UrlBuilder.fromString(API_ENDPOINT)
+                .addParameter("appid", appId)
+                .addParameter("format", "image,plaintext")
+                .addParameter("input", query)
+                .toUri())
+            .GET()
+            .build();
+
+        CompletableFuture<HttpResponse<String>> apiResponse =
+                CLIENT.sendAsync(request, HttpResponse.BodyHandlers.ofString());
+
+        // Parse and respond
+        apiResponse.thenApply(handler::handleApiResponse)
+            .thenAccept(response -> sendResponse(response, event));
+    }
+
+    private static void sendResponse(@NotNull WolframAlphaHandler.HandlerResponse response,
+            @NotNull IDeferrableCallback event) {
+        WebhookMessageUpdateAction<Message> action =
+                event.getHook().editOriginalEmbeds(response.embeds());
+
+        for (WolframAlphaHandler.Attachment attachment : response.attachments()) {
+            action = action.addFile(attachment.data(), attachment.name());
+        }
+
+        action.queue();
+    }
+}