phabricator mail address header normalization: To: -> differential reviewers or maniphest task owner, Cc: subscribers (up to 3)

phabricator.sieve

require [ "regex", "editheader", "relational", "variables" ];

if header :is "X-Phabricator-Sent-This-Message" "Yes" {
  # assumption: common mail domain
  set "msfx" "@example.com";
  # match up to 3 subscribers
  if header :regex "X-Phabricator-Stamps" "subscriber\\([@#]([^\\)]+)\\)(.+subscriber\\([@#]([^\\)]+)\\))?(.+subscriber\\([@#]([^\\)]+)\\))?" {
    set "psub" "${1}${msfx}";
    if string :count "ne" "${3}" ["0"] {
      set "psub" "${psub}, ${3}${msfx}";
      if string :count "ne" "${5}" ["0"] {
        set "psub" "${psub}, ${5}${msfx}";
      }
    }
  }
  # match up to 3 reviewers
  if header :regex "X-Phabricator-Stamps" "application\\(Differential\\).+reviewer\\([@#]([^)]+)\\)(.+reviewer\\([@#]([^)]+)\\))?(.+reviewer\\([@#]([^)]+)\\).+)?" {
    set "prev" "${1}${msfx}";
    if string :count "ne" "${3}" ["0"] {
      set "prev" "${prev}, ${3}${msfx}";
      if string :count "ne" "${5}" ["0"] {
        set "prev" "${prev}, ${5}${msfx}";
      }
    }
  }
  # match task assignee
  if header :regex "X-Phabricator-Stamps" "application\\(Maniphest\\).+task-owner\\(@([^)]+)\\)" {
    set "pass" "${1}${msfx}";
  }
  if string :count "ne" "${pass}" ["0"] {
    deleteheader "To";
    addheader :last "To" "${pass}";
  } elsif string :count "ne" "${prev}" ["0"] {
    deleteheader "To";
    addheader :last "To" "${prev}";
  }
  if string :count "ne" "${psub}" ["0"] {
    deleteheader "Cc";
    addheader :last "Cc" "${psub}";
  }
}