main.tf

# ========
#  Config
# ========

data "azurerm_client_config" "current" {}

# Suffix - for globally unique resource names

resource "random_string" "suffix" {
  length  = 4
  special = false
  upper   = false
}

locals {
  suffix                    = random_string.suffix.result
  application_owners_ids    = length(var.application_owners_ids) == 0 ? [data.azurerm_client_config.current.object_id] : var.application_owners_ids
  superadmins_aad_object_id = var.superadmins_aad_object_id == "" ? data.azurerm_client_config.current.object_id : var.superadmins_aad_object_id # Default to current ARM client
  tags                      = merge(var.default_tags, var.custom_tags)
}

# =================
#  Azure AD Groups
# =================

resource "azuread_group" "groups" {
  for_each                = var.groups
  display_name            = "demo-${each.value}-${local.suffix}"
  prevent_duplicate_names = true
  security_enabled        = true
}

# ====================
#  Service Principals
# ====================

# TODO: document use for CI only. Apps should use diff. SP per PILP

module "service_principals" {
  for_each    = var.environments
  source      = "./modules/service-principal"
  name        = "${each.value.team}-${each.value.env}-${local.suffix}-ci-sp"
  owners_list = local.application_owners_ids
}

# ==============================
#  ARM Resources ("Workspaces")
# ==============================

# Resource Group, Storage Account, and Key Vault

module "arm_environments" {
  for_each             = var.environments
  source               = "./modules/azure-resources"
  name                 = "${each.value.team}-${each.value.env}-${local.suffix}"
  devs_group_id        = azuread_group.groups["${each.value.team}_devs"].id
  admins_group_id      = azuread_group.groups["${each.value.team}_admins"].id
  superadmins_group_id = local.superadmins_aad_object_id
  service_principal_id = module.service_principals["${each.value.team}_${each.value.env}"].principal_id
  tags                 = local.tags

  depends_on = [
    azuread_group.groups,
    module.service_principals
  ]
}

# ==============
#  Azure DevOps
# ==============

# The following section Bootstraps:
# - Projects: Team silos and shared projects
# - Security Group Assignments: like Role Assignments in ARM
# - Service Connections: service principal credentials created in code above

# ==============
#  ADO Projects
# ==============

# Team Projects

resource "azuredevops_project" "team_projects" {
  for_each        = var.projects
  name            = each.value.name
  description     = each.value.description
  visibility      = "private"
  version_control = "Git"

  features = {
    repositories = "enabled"
    pipelines    = "enabled"
    artifacts    = "disabled"
    boards       = "disabled"
    testplans    = "disabled"
  }
}

# Supermarket Project

resource "azuredevops_project" "supermarket" {
  name            = "supermarket"
  description     = "Example: 1 project, many teams, many repos"
  visibility      = "private"
  version_control = "Git"

  features = {
    boards       = "enabled"
    repositories = "enabled"
    pipelines    = "enabled"
    artifacts    = "disabled"
    testplans    = "disabled"
  }
}

# Shared Collaboration Project (Only Azure Boards)

resource "azuredevops_project" "collaboration" {
  name            = "shared-collaboration"
  description     = "Example: what if separate teams should talk to each other? (Disadvantage: cannot link external project commits to work items in this project)"
  visibility      = "private"
  version_control = "Git"

  features = {
    boards       = "enabled"
    repositories = "disabled"
    pipelines    = "disabled"
    artifacts    = "disabled"
    testplans    = "disabled"
  }
}

# ================================
#  ADO Security Group Assignments
# ================================

# Teams Silo Projects -  Security Group Assignments

module "ado_team_permissions" {
  for_each       = var.projects
  source         = "./modules/azure-devops-permissions"
  ado_project_id = azuredevops_project.team_projects["${each.value.team}"].id
  team_aad_id    = azuread_group.groups["${each.value.team}_devs"].id   # Receives 'Contributor' Permissions
  admin_aad_id   = azuread_group.groups["${each.value.team}_admins"].id # Receives 'Project Administrator' Permissions

  depends_on = [
    azuread_group.groups,
    azuredevops_project.team_projects
  ]
}

# Supermarket Project - Security Group Assignments
# TODO: supermarket collab model with devs, admins and all

module "ado_supermarket_permissions_fruits" {
  source         = "./modules/azure-devops-permissions"
  ado_project_id = azuredevops_project.supermarket.id
  team_aad_id    = azuread_group.groups["fruits_devs"].id   # Receives 'Contributor' Permissions
  admin_aad_id   = azuread_group.groups["fruits_admins"].id # Receives 'Project Administrator' Permissions

  depends_on = [
    azuread_group.groups,
    azuredevops_project.team_projects,
    azuredevops_project.supermarket
  ]
}

module "ado_supermarket_permissions_veggies" {
  source         = "./modules/azure-devops-permissions"
  ado_project_id = azuredevops_project.supermarket.id
  team_aad_id    = azuread_group.groups["veggies_devs"].id   # Receives 'Contributor' Permissions
  admin_aad_id   = azuread_group.groups["veggies_admins"].id # Receives 'Project Administrator' Permissions

  depends_on = [
    azuread_group.groups,
    azuredevops_project.team_projects,
    azuredevops_project.supermarket
  ]
}

# Collaboration Project - Security Group Assignments

module "ado_collaboration_permissions_fruits" {
  source         = "./modules/azure-devops-permissions"
  ado_project_id = azuredevops_project.collaboration.id
  team_aad_id    = azuread_group.groups["fruits_devs"].id   # Receives 'Contributor' Permissions
  admin_aad_id   = azuread_group.groups["fruits_admins"].id # Receives 'Project Administrator' Permissions

  depends_on = [
    azuread_group.groups,
    azuredevops_project.team_projects,
    azuredevops_project.collaboration
  ]
}

module "ado_collaboration_permissions_veggies" {
  source         = "./modules/azure-devops-permissions"
  ado_project_id = azuredevops_project.collaboration.id
  team_aad_id    = azuread_group.groups["veggies_devs"].id   # Receives 'Contributor' Permissions
  admin_aad_id   = azuread_group.groups["veggies_admins"].id # Receives 'Project Administrator' Permissions

  depends_on = [
    azuread_group.groups,
    azuredevops_project.team_projects,
    azuredevops_project.collaboration
  ]
}

# =========================
#  ADO Service Connections
# =========================

module "service_connections" {
  for_each                 = module.arm_environments
  source                   = "./modules/azure-devops-service-connection"
  service_principal_id     = module.service_principals[each.key].principal_id
  service_principal_secret = module.service_principals[each.key].client_secret
  resource_group_name      = "${replace(each.key, "_", "-")}-${local.suffix}-rg"
  project_id               = azuredevops_project.team_projects[replace(each.key, "/(_dev)|(_prod)|(_shared)/", "")].id

  depends_on = [
    azuread_group.groups,
    azuredevops_project.team_projects,
    module.arm_environments,
    module.service_principals
  ]
}