Add verbose debug logging for GarminConnect responses

Introduces a DEBUG_GARMIN_VERBOSE flag to enable detailed logging of HTTP responses and ticket extraction attempts in the GarminConnect authentication flow. This aids in troubleshooting login and MFA issues by providing more insight into response contents and extraction logic.

Author: cagnulein

.claude/settings.local.json

@@ -0,0 +1,7 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git log:*)"
+    ]
+  }
+}

src/garminconnect.cpp

@@ -585,6 +585,12 @@ bool GarminConnect::performLogin(const QString &email, const QString &password,
         responseUrl = reply->url();
     }
 
+    if (DEBUG_GARMIN_VERBOSE) {
+        qDebug() << "GarminConnect: Response URL:" << responseUrl.toString();
+        qDebug() << "GarminConnect: Response length:" << response.length();
+        qDebug() << "GarminConnect: Full response body:" << response;
+    }
+
     QUrlQuery responseQuery(responseUrl);
     QString ticket = responseQuery.queryItemValue("ticket");
 
@@ -602,6 +608,8 @@ bool GarminConnect::performLogin(const QString &email, const QString &password,
             if (match.hasMatch()) {
                 ticket = match.captured(1);
                 qDebug() << "GarminConnect: Found ticket with fallback pattern:" << ticket.left(20) << "...";
+            } else if (DEBUG_GARMIN_VERBOSE) {
+                qDebug() << "GarminConnect: No ticket patterns matched in response body";
             }
         }
     }
@@ -611,6 +619,9 @@ bool GarminConnect::performLogin(const QString &email, const QString &password,
     if (ticket.isEmpty()) {
         m_lastError = "Failed to extract ticket from login response";
         qDebug() << "GarminConnect:" << m_lastError;
+        if (DEBUG_GARMIN_VERBOSE) {
+            qDebug() << "GarminConnect: Response snippet:" << response.left(1000);
+        }
         return false;
     }
 
@@ -711,8 +722,12 @@ void GarminConnect::handleMfaReplyFinished()
     qDebug() << "GarminConnect: MFA response status code:" << statusCode;
     qDebug() << "GarminConnect: MFA response redirect URL:" << responseUrl.toString();
 
-    // If no redirect, log response body to understand what happened
-    if (responseUrl.isEmpty()) {
+    // Log detailed response information
+    if (DEBUG_GARMIN_VERBOSE) {
+        qDebug() << "GarminConnect: MFA response length:" << response.length();
+        qDebug() << "GarminConnect: Full MFA response body:" << response;
+    } else if (responseUrl.isEmpty()) {
+        // If no redirect, log response body to understand what happened (non-verbose)
         qDebug() << "GarminConnect: MFA response body (first 500 chars):" << response.left(500);
     }
 
@@ -751,6 +766,9 @@ void GarminConnect::handleMfaReplyFinished()
 
     // If not found in redirect URL, try response body
     if (ticket.isEmpty() && !response.isEmpty()) {
+        if (DEBUG_GARMIN_VERBOSE) {
+            qDebug() << "GarminConnect: Attempting to extract ticket from MFA response body";
+        }
         // Try multiple patterns for ticket extraction
         QRegularExpression ticketRegex1("embed\\?ticket=([^\"]+)\"");
         QRegularExpression ticketRegex2("ticket=([^&\"']+)");
@@ -764,6 +782,16 @@ void GarminConnect::handleMfaReplyFinished()
             if (match.hasMatch()) {
                 ticket = match.captured(1);
                 qDebug() << "GarminConnect: Found ticket in response body (pattern 2):" << ticket.left(20) << "...";
+            } else if (DEBUG_GARMIN_VERBOSE) {
+                qDebug() << "GarminConnect: No MFA ticket patterns matched. Checking for other patterns...";
+                // Check for JSON format
+                if (response.contains("ticket")) {
+                    qDebug() << "GarminConnect: Response contains 'ticket' keyword, may be JSON or different format";
+                }
+                // Check for common response patterns
+                if (response.contains("\"")) {
+                    qDebug() << "GarminConnect: Response contains quoted strings (may be JSON)";
+                }
             }
         }
     }
@@ -773,6 +801,9 @@ void GarminConnect::handleMfaReplyFinished()
     if (ticket.isEmpty()) {
         m_lastError = "Failed to extract ticket after MFA";
         qDebug() << "GarminConnect:" << m_lastError;
+        if (DEBUG_GARMIN_VERBOSE) {
+            qDebug() << "GarminConnect: Response snippet:" << response.left(1000);
+        }
         emit authenticationFailed(m_lastError);
         return;
     }

src/garminconnect.h

@@ -176,6 +176,7 @@ class GarminConnect : public QObject
     static constexpr const char* SSO_URL_PATH = "/sso/signin";
     static constexpr const char* SSO_EMBED_PATH = "/sso/embed";
     static constexpr const char* OAUTH_CONSUMER_URL = "https://thegarth.s3.amazonaws.com/oauth_consumer.json";
+    static constexpr bool DEBUG_GARMIN_VERBOSE = true; // Set to true for detailed response logging (may contain sensitive data)
 
     // Private methods
     QString ssoUrl() const { return QString("https://sso.%1").arg(m_domain); }