Config based approach to commands

README.md

@@ -5,6 +5,34 @@ It uses GitHub webhooks to scale across repositories without needing to add a Gi
 
 GitHub apps are used for authentication to limit the required permissions.
 
+## Configuration
+
+The app can be configured with a `.github/comment-ops.yml` file in the main branch of the repository.
+
+This can also be applied organization wide by creating it in the organization's `.github` repository.
+
+The order of configuration is:
+
+`default config` -> `organization` -> `repository`
+
+Default configuration:
+
+```yaml
+commands:
+  label:
+    allowedLabels: [] # any label is allowed
+    enabled: true
+  removeLabel:
+    allowedLabels: [] # any label is allowed
+    enabled: true
+  reopen:
+    enabled: true
+  reviewer:
+    enabled: true
+  transfer:
+    enabled: true
+```
+
 ## Getting started
 
 First you will need to create a GitHub app. Add the permissions required for the commands you are using (see next section), and tick "Subscribe to events" > "Issue comment"

app/command-enabled.js

@@ -0,0 +1,87 @@
+const enabled = {
+  enabled: true,
+};
+
+function notEnabled(command) {
+  return {
+    enabled: false,
+    error: `The \`${command}\` is not enabled for this repository`,
+  };
+}
+
+export function transferEnabled(config) {
+  if (!config.commands.transfer.enabled) {
+    return notEnabled("transfer");
+  }
+
+  return enabled;
+}
+
+export function labelEnabled(config, labels) {
+  const labelConfig = config.commands.label;
+
+  if (!labelConfig.enabled) {
+    return notEnabled("label");
+  }
+
+  if (
+    // if length is = 0 then all labels are allowed
+    labelConfig.allowedLabels.length > 0 &&
+    !labels.every((label) => labelConfig.allowedLabels.includes(label))
+  ) {
+    return {
+      enabled: false,
+      error: `${labels} doesn't match the allowed labels \`${labelConfig.allowedLabels.join(
+        ","
+      )}\``,
+    };
+  }
+
+  return enabled;
+}
+
+export function closeEnabled(config) {
+  if (!config.commands.close.enabled) {
+    return notEnabled("close");
+  }
+
+  return enabled;
+}
+
+export function reopenEnabled(config) {
+  if (!config.commands.reopen.enabled) {
+    return notEnabled("reopen");
+  }
+
+  return enabled;
+}
+
+export function removeLabelEnabled(config, labels) {
+  const labelConfig = config.commands.removeLabel;
+  if (!labelConfig.enabled) {
+    return notEnabled("remove-label");
+  }
+
+  if (
+    // if length is = 0 then all labels are allowed
+    labelConfig.allowedLabels.length > 0 &&
+    !labels.every((label) => labelConfig.allowedLabels.includes(label))
+  ) {
+    return {
+      enabled: false,
+      error: `${labels} doesn't match the allowed labels \`${labelConfig.allowedLabels.join(
+        ","
+      )}\``,
+    };
+  }
+
+  return enabled;
+}
+
+export function reviewerEnabled(config) {
+  if (!config.commands.reviewer.enabled) {
+    return notEnabled("reviewer");
+  }
+
+  return enabled;
+}