Class: Gmail::Service

Inherits:
Object
  • Object
show all
Defined in:
lib/utilities/gmail/service.rb

Constant Summary collapse

SCOPES = 
[
  "https://www.googleapis.com/auth/gmail.readonly",
  "https://www.googleapis.com/auth/gmail.send",
  "https://www.googleapis.com/auth/gmail.modify"
]
SCOPE = 
SCOPES.join(" ")

Instance Method Summary collapse

Constructor Details

#initialize(skip_auth: false) ⇒ Service

Returns a new instance of Service.



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# File 'lib/utilities/gmail/service.rb', line 24

def initialize(skip_auth: false)
  ensure_env!
  @service = Google::Apis::GmailV1::GmailService.new
  @service.authorization = authorize unless skip_auth
end

Instance Method Details

#add_label(email_id, label) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 228

def add_label(email_id, label)
  label_id = resolve_label_id(label)
  modify_message(email_id, add_label_ids: [label_id])
end

#archive_email(email_id) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 238

def archive_email(email_id)
  modify_message(email_id, remove_label_ids: ["INBOX"])
end

#authenticate ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 267

def authenticate
  perform_auth_flow
  {success: true}
rescue => e
  {success: false, error: e.message}
end

#get_email_content(email_id) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 107

def get_email_content(email_id)
  message = @service.get_user_message("me", email_id)

  # Extract email metadata
  headers = extract_headers(message.payload)

  # Extract email body
  body_data = extract_body(message.payload)

  {
    id: message.id,
    thread_id: message.thread_id,
    subject: headers["Subject"],
    from: headers["From"],
    to: headers["To"],
    cc: headers["Cc"],
    bcc: headers["Bcc"],
    date: headers["Date"],
    body: body_data[:text],
    body_html: body_data[:html],
    snippet: message.snippet,
    labels: message.label_ids || [],
    attachments: extract_attachments(message.payload)
  }
rescue Google::Apis::Error => e
  raise "Gmail API Error: #{e.message}"
rescue => e
  log_error("get_email_content", e)
  raise e
end

#list_emails(start_date: nil, end_date: nil, max_results: 20, sender: nil, subject: nil, labels: nil, read_status: nil) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 30

def list_emails(start_date: nil, end_date: nil, max_results: 20, sender: nil, subject: nil, labels: nil, read_status: nil)
  query_parts = []

  # Date filtering
  if start_date
    query_parts << "after:#{start_date}"
  end
  if end_date
    query_parts << "before:#{end_date}"
  end

  # Sender filtering
  if sender
    query_parts << "from:#{sender}"
  end

  # Subject filtering
  if subject
    query_parts << "subject:\"#{subject}\""
  end

  # Labels filtering
  if labels && !labels.empty?
    if labels.is_a?(Array)
      labels.each { |label| query_parts << "label:#{label}" }
    else
      query_parts << "label:#{labels}"
    end
  end

  # Read/unread status
  case read_status&.downcase
  when "unread"
    query_parts << "is:unread"
  when "read"
    query_parts << "is:read"
  end

  query = query_parts.join(" ")

  results = @service.list_user_messages(
    "me",
    q: query.empty? ? nil : query,
    max_results: max_results
  )

  emails = (results.messages || []).map do |message|
    get_email_summary(message.id)
  end.compact

  {emails: emails, count: emails.length}
rescue Google::Apis::Error => e
  raise "Gmail API Error: #{e.message}"
rescue => e
  log_error("list_emails", e)
  raise e
end

#mark_as_read(email_id) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 220

def mark_as_read(email_id)
  modify_message(email_id, remove_label_ids: ["UNREAD"])
end

#mark_as_unread(email_id) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 224

def mark_as_unread(email_id)
  modify_message(email_id, add_label_ids: ["UNREAD"])
end

#perform_auth_flow ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 274

def perform_auth_flow
  client_id = Mcpeasy::Config.google_client_id
  client_secret = Mcpeasy::Config.google_client_secret

  unless client_id && client_secret
    raise "Google credentials not found. Please save your credentials.json file using: mcpz config set_google_credentials <path_to_credentials.json>"
  end

  # Create credentials using OAuth2 flow with localhost redirect
  redirect_uri = "http://localhost:8080"
  client = Signet::OAuth2::Client.new(
    client_id: client_id,
    client_secret: client_secret,
    scope: SCOPE,
    redirect_uri: redirect_uri,
    authorization_uri: "https://accounts.google.com/o/oauth2/auth",
    token_credential_uri: "https://oauth2.googleapis.com/token"
  )

  # Generate authorization URL
  url = client.authorization_uri.to_s

  puts "DEBUG: Client ID: #{client_id[0..20]}..."
  puts "DEBUG: Scope: #{SCOPE}"
  puts "DEBUG: Redirect URI: #{redirect_uri}"
  puts

  # Start callback server to capture OAuth code
  puts "Starting temporary web server to capture OAuth callback..."
  puts "Opening authorization URL in your default browser..."
  puts url
  puts

  # Automatically open URL in default browser on macOS/Unix
  if system("which open > /dev/null 2>&1")
    system("open", url)
  else
    puts "Could not automatically open browser. Please copy the URL above manually."
  end
  puts
  puts "Waiting for OAuth callback... (will timeout in 60 seconds)"

  # Wait for the authorization code with timeout
  code = GoogleAuthServer.capture_auth_code

  unless code
    raise "Failed to receive authorization code. Please try again."
  end

  puts "✅ Authorization code received!"
  client.code = code
  client.fetch_access_token!

  # Save credentials to config
  credentials_data = {
    client_id: client.client_id,
    client_secret: client.client_secret,
    scope: client.scope,
    refresh_token: client.refresh_token,
    access_token: client.access_token,
    expires_at: client.expires_at
  }

  Mcpeasy::Config.save_google_token(credentials_data)
  puts "✅ Authentication successful! Token saved to config"

  client
rescue => e
  log_error("perform_auth_flow", e)
  raise "Authentication flow failed: #{e.message}"
end

#remove_label(email_id, label) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 233

def remove_label(email_id, label)
  label_id = resolve_label_id(label)
  modify_message(email_id, remove_label_ids: [label_id])
end

#reply_to_email(email_id:, body:, include_quoted: true) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 166

def reply_to_email(email_id:, body:, include_quoted: true)
  # Get the original message to extract reply information
  original = @service.get_user_message("me", email_id)
  headers = extract_headers(original.payload)

  # Build reply headers
  original_subject = headers["Subject"] || ""
  reply_subject = original_subject.start_with?("Re:") ? original_subject : "Re: #{original_subject}"

  reply_to = headers["Reply-To"] || headers["From"]
  message_id = headers["Message-ID"]

  # Prepare reply body
  reply_body = body
  if include_quoted
    original_body = extract_body(original.payload)[:text]
    date_str = headers["Date"]
    from_str = headers["From"]

    reply_body += "\n\n"
    reply_body += "On #{date_str}, #{from_str} wrote:\n"
    reply_body += original_body.split("\n").map { |line| "> #{line}" }.join("\n")
  end

  mail = Mail.new do
    to reply_to
    subject reply_subject
    body reply_body
    in_reply_to message_id if message_id
    references message_id if message_id
  end

  raw_message = mail.to_s
  encoded_message = Base64.urlsafe_encode64(raw_message)

  message_object = Google::Apis::GmailV1::Message.new(
    raw: encoded_message,
    thread_id: original.thread_id
  )

  result = @service.send_user_message("me", message_object)

  {
    success: true,
    message_id: result.id,
    thread_id: result.thread_id
  }
rescue Google::Apis::Error => e
  raise "Gmail API Error: #{e.message}"
rescue => e
  log_error("reply_to_email", e)
  raise e
end

#search_emails(query, max_results: 10) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 88

def search_emails(query, max_results: 10)
  results = @service.list_user_messages(
    "me",
    q: query,
    max_results: max_results
  )

  emails = (results.messages || []).map do |message|
    get_email_summary(message.id)
  end.compact

  {emails: emails, count: emails.length}
rescue Google::Apis::Error => e
  raise "Gmail API Error: #{e.message}"
rescue => e
  log_error("search_emails", e)
  raise e
end

#send_email(to:, subject:, body:, cc: nil, bcc: nil, reply_to: nil) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 138

def send_email(to:, subject:, body:, cc: nil, bcc: nil, reply_to: nil)
  mail = Mail.new do
    to to
    cc cc if cc
    bcc bcc if bcc
    subject subject
    body body
    reply_to reply_to if reply_to
  end

  raw_message = mail.to_s
  encoded_message = Base64.urlsafe_encode64(raw_message)

  message_object = Google::Apis::GmailV1::Message.new(raw: encoded_message)
  result = @service.send_user_message("me", message_object)

  {
    success: true,
    message_id: result.id,
    thread_id: result.thread_id
  }
rescue Google::Apis::Error => e
  raise "Gmail API Error: #{e.message}"
rescue => e
  log_error("send_email", e)
  raise e
end

#test_connection ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 252

def test_connection
  profile = @service.("me")
  {
    ok: true,
    email: profile.email_address,
    messages_total: profile.messages_total,
    threads_total: profile.threads_total
  }
rescue Google::Apis::Error => e
  raise "Gmail API Error: #{e.message}"
rescue => e
  log_error("test_connection", e)
  raise e
end

#trash_email(email_id) ⇒ Object 



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# File 'lib/utilities/gmail/service.rb', line 242

def trash_email(email_id)
  @service.trash_user_message("me", email_id)
  {success: true}
rescue Google::Apis::Error => e
  raise "Gmail API Error: #{e.message}"
rescue => e
  log_error("trash_email", e)
  raise e
end