Merge branch 'api-gpg-key-management' into 'master'

API: Add GPG key management

Closes #36926

See merge request !13828

5 files changed, 696 insertions, 0 deletions

diff --git a/changelogs/unreleased/api-gpg-key-management.yml b/changelogs/unreleased/api-gpg-key-management.yml
new file mode 100644
index 00000000000..0be35a5823b
--- /dev/null
+++ b/changelogs/unreleased/api-gpg-key-management.yml
@@ -0,0 +1,5 @@
+---
+title: 'API: Add GPG key management'
+merge_request: 13828
+author: Robert Schilling
+type: added
diff --git a/doc/api/users.md b/doc/api/users.md
index 57a13eb477d..57b4e117cf3 100644
--- a/doc/api/users.md
+++ b/doc/api/users.md
@@ -550,6 +550,217 @@ Parameters:
 
 Will return `200 OK` on success, or `404 Not found` if either user or key cannot be found.
 
+## List all GPG keys
+
+Get a list of currently authenticated user's GPG keys.
+
+```
+GET /user/gpg_keys
+```
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/user/gpg_keys
+```
+
+Example response:
+
+```json
+[
+    {
+        "id": 1,
+        "key": "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n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\r\no4nlxaz65VucmNbN1aMbDXLJVSqR1DuE00vEsL1AItI=\r\n=XQoy\r\n-----END PGP PUBLIC KEY BLOCK-----",
+        "created_at": "2017-09-05T09:17:46.264Z"
+    }
+]
+```
+
+## Get a specific GPG key
+
+Get a specific GPG key of currently authenticated user.
+
+```
+GET /user/gpg_keys/:key_id
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `key_id`  | integer | yes   | The ID of the GPG key |
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/user/gpg_keys/1
+```
+
+Example response:
+
+```json
+  {
+      "id": 1,
+      "key": "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n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\r\no4nlxaz65VucmNbN1aMbDXLJVSqR1DuE00vEsL1AItI=\r\n=XQoy\r\n-----END PGP PUBLIC KEY BLOCK-----",
+      "created_at": "2017-09-05T09:17:46.264Z"
+  }
+```
+
+## Add a GPG key
+
+Creates a new GPG key owned by the currently authenticated user.
+
+```
+POST /user/gpg_keys
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| key       | string | yes    | The new GPG key |
+
+```bash
+curl --data "key=-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n\r\nxsBNBFV..."  --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/user/gpg_keys
+```
+
+Example response:
+
+```json
+[
+    {
+        "id": 1,
+        "key": "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n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\r\no4nlxaz65VucmNbN1aMbDXLJVSqR1DuE00vEsL1AItI=\r\n=XQoy\r\n-----END PGP PUBLIC KEY BLOCK-----",
+        "created_at": "2017-09-05T09:17:46.264Z"
+    }
+]
+```
+
+## Delete a GPG key
+
+Delete a GPG key owned by currently authenticated user.
+
+```
+DELETE /user/gpg_keys/:key_id
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `key_id`  | integer | yes   | The ID of the GPG key |
+
+```bash
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/user/gpg_keys/1
+```
+
+Returns `204 No Content` on success, or `404 Not found` if the key cannot be found.
+
+## List all GPG keys for given user
+
+Get a list of a specified user's GPG keys. Available only for admins.
+
+```
+GET /users/:id/gpg_keys
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `id`      | integer | yes   | The ID of the user |
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/users/2/gpg_keys
+```
+
+Example response:
+
+```json
+[
+    {
+        "id": 1,
+        "key": "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n\r\nxsBNBFVjnlIBCACibzXOLCiZiL2oyzYUaTOCkYnSUhymg3pdbfKtd4mpBa58xKBj\r\nt1pTHVpw3Sk03wmzhM/Ndlt1AV2YhLv++83WKr+gAHFYFiCV/tnY8bx3HqvVoy8O\r\nCfxWhw4QZK7+oYzVmJj8ZJm3ZjOC4pzuegNWlNLCUdZDx9OKlHVXLCX1iUbjdYWa\r\nqKV6tdV8hZolkbyjedQgrpvoWyeSHHpwHF7yk4gNJWMMI5rpcssL7i6mMXb/sDzO\r\nVaAtU5wiVducsOa01InRFf7QSTxoAm6Xy0PGv/k48M6xCALa9nY+BzlOv47jUT57\r\nvilf4Szy9dKD0v9S0mQ+IHB+gNukWrnwtXx5ABEBAAHNFm5hbWUgKGNvbW1lbnQp\r\nIDxlbUBpbD7CwHUEEwECACkFAlVjnlIJEINgJNgv009/AhsDAhkBBgsJCAcDAgYV\r\nCAIJCgsEFgIDAQAAxqMIAFBHuBA8P1v8DtHonIK8Lx2qU23t8Mh68HBIkSjk2H7/\r\noO2cDWCw50jZ9D91PXOOyMPvBWV2IE3tARzCvnNGtzEFRtpIEtZ0cuctxeIF1id5\r\ncrfzdMDsmZyRHAOoZ9VtuD6mzj0ybQWMACb7eIHjZDCee3Slh3TVrLy06YRdq2I4\r\nbjMOPePtK5xnIpHGpAXkB3IONxyITpSLKsA4hCeP7gVvm7r7TuQg1ygiUBlWbBYn\r\niE5ROzqZjG1s7dQNZK/riiU2umGqGuwAb2IPvNiyuGR3cIgRE4llXH/rLuUlspAp\r\no4nlxaz65VucmNbN1aMbDXLJVSqR1DuE00vEsL1AItI=\r\n=XQoy\r\n-----END PGP PUBLIC KEY BLOCK-----",
+        "created_at": "2017-09-05T09:17:46.264Z"
+    }
+]
+```
+
+## Get a specific GPG key for a given user
+
+Get a specific GPG key for a given user. Available only for admins.
+
+```
+GET /users/:id/gpg_keys/:key_id
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `id`      | integer | yes   | The ID of the user |
+| `key_id`  | integer | yes   | The ID of the GPG key |
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/users/2/gpg_keys/1
+```
+
+Example response:
+
+```json
+  {
+      "id": 1,
+      "key": "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n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\r\no4nlxaz65VucmNbN1aMbDXLJVSqR1DuE00vEsL1AItI=\r\n=XQoy\r\n-----END PGP PUBLIC KEY BLOCK-----",
+      "created_at": "2017-09-05T09:17:46.264Z"
+  }
+```
+
+## Add a GPG key for a given user
+
+Create new GPG key owned by the specified user. Available only for admins.
+
+```
+POST /users/:id/gpg_keys
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `id`      | integer | yes   | The ID of the user |
+| `key_id`  | integer | yes   | The ID of the GPG key |
+
+```bash
+curl --data "key=-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n\r\nxsBNBFV..."  --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/users/2/gpg_keys
+```
+
+Example response:
+
+```json
+[
+    {
+        "id": 1,
+        "key": "-----BEGIN PGP PUBLIC KEY BLOCK-----\r\n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\r\no4nlxaz65VucmNbN1aMbDXLJVSqR1DuE00vEsL1AItI=\r\n=XQoy\r\n-----END PGP PUBLIC KEY BLOCK-----",
+        "created_at": "2017-09-05T09:17:46.264Z"
+    }
+]
+```
+
+## Delete a GPG key for a given user
+
+Delete a GPG key owned by a specified user. Available only for admins.
+
+```
+DELETE /users/:id/gpg_keys/:key_id
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `id`      | integer | yes   | The ID of the user |
+| `key_id`  | integer | yes   | The ID of the GPG key |
+
+```bash
+curl --request DELETE --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/users/2/gpg_keys/1
+```
+
 ## List emails
 
 Get a list of currently authenticated user's emails.
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 0092cc14e74..031dd02c6eb 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -491,6 +491,10 @@ module API
       expose :user, using: Entities::UserPublic
     end
 
+    class GPGKey < Grape::Entity
+      expose :id, :key, :created_at
+    end
+
     class Note < Grape::Entity
       # Only Issue and MergeRequest have iid
       NOTEABLE_TYPES_WITH_IID = %w(Issue MergeRequest).freeze
diff --git a/lib/api/users.rb b/lib/api/users.rb
index 96f47bb618a..1825c90a23b 100644
--- a/lib/api/users.rb
+++ b/lib/api/users.rb
@@ -233,6 +233,86 @@ module API
         destroy_conditionally!(key)
       end
 
+      desc 'Add a GPG key to a specified user. Available only for admins.' do
+        detail 'This feature was added in GitLab 10.0'
+        success Entities::GPGKey
+      end
+      params do
+        requires :id, type: Integer, desc: 'The ID of the user'
+        requires :key, type: String, desc: 'The new GPG key'
+      end
+      post ':id/gpg_keys' do
+        authenticated_as_admin!
+
+        user = User.find_by(id: params.delete(:id))
+        not_found!('User') unless user
+
+        key = user.gpg_keys.new(declared_params(include_missing: false))
+
+        if key.save
+          present key, with: Entities::GPGKey
+        else
+          render_validation_error!(key)
+        end
+      end
+
+      desc 'Get the GPG keys of a specified user. Available only for admins.' do
+        detail 'This feature was added in GitLab 10.0'
+        success Entities::GPGKey
+      end
+      params do
+        requires :id, type: Integer, desc: 'The ID of the user'
+        use :pagination
+      end
+      get ':id/gpg_keys' do
+        authenticated_as_admin!
+
+        user = User.find_by(id: params[:id])
+        not_found!('User') unless user
+
+        present paginate(user.gpg_keys), with: Entities::GPGKey
+      end
+
+      desc 'Delete an existing GPG key from a specified user. Available only for admins.' do
+        detail 'This feature was added in GitLab 10.0'
+      end
+      params do
+        requires :id, type: Integer, desc: 'The ID of the user'
+        requires :key_id, type: Integer, desc: 'The ID of the GPG key'
+      end
+      delete ':id/gpg_keys/:key_id' do
+        authenticated_as_admin!
+
+        user = User.find_by(id: params[:id])
+        not_found!('User') unless user
+
+        key = user.gpg_keys.find_by(id: params[:key_id])
+        not_found!('GPG Key') unless key
+
+        status 204
+        key.destroy
+      end
+
+      desc 'Revokes an existing GPG key from a specified user. Available only for admins.' do
+        detail 'This feature was added in GitLab 10.0'
+      end
+      params do
+        requires :id, type: Integer, desc: 'The ID of the user'
+        requires :key_id, type: Integer, desc: 'The ID of the GPG key'
+      end
+      post ':id/gpg_keys/:key_id/revoke' do
+        authenticated_as_admin!
+
+        user = User.find_by(id: params[:id])
+        not_found!('User') unless user
+
+        key = user.gpg_keys.find_by(id: params[:key_id])
+        not_found!('GPG Key') unless key
+
+        key.revoke
+        status :accepted
+      end
+
       desc 'Add an email address to a specified user. Available only for admins.' do
         success Entities::Email
       end
@@ -492,6 +572,76 @@ module API
         destroy_conditionally!(key)
       end
 
+      desc "Get the currently authenticated user's GPG keys" do
+        detail 'This feature was added in GitLab 10.0'
+        success Entities::GPGKey
+      end
+      params do
+        use :pagination
+      end
+      get 'gpg_keys' do
+        present paginate(current_user.gpg_keys), with: Entities::GPGKey
+      end
+
+      desc 'Get a single GPG key owned by currently authenticated user' do
+        detail 'This feature was added in GitLab 10.0'
+        success Entities::GPGKey
+      end
+      params do
+        requires :key_id, type: Integer, desc: 'The ID of the GPG key'
+      end
+      get 'gpg_keys/:key_id' do
+        key = current_user.gpg_keys.find_by(id: params[:key_id])
+        not_found!('GPG Key') unless key
+
+        present key, with: Entities::GPGKey
+      end
+
+      desc 'Add a new GPG key to the currently authenticated user' do
+        detail 'This feature was added in GitLab 10.0'
+        success Entities::GPGKey
+      end
+      params do
+        requires :key, type: String, desc: 'The new GPG key'
+      end
+      post 'gpg_keys' do
+        key = current_user.gpg_keys.new(declared_params)
+
+        if key.save
+          present key, with: Entities::GPGKey
+        else
+          render_validation_error!(key)
+        end
+      end
+
+      desc 'Revoke a GPG key owned by currently authenticated user' do
+        detail 'This feature was added in GitLab 10.0'
+      end
+      params do
+        requires :key_id, type: Integer, desc: 'The ID of the GPG key'
+      end
+      post 'gpg_keys/:key_id/revoke' do
+        key = current_user.gpg_keys.find_by(id: params[:key_id])
+        not_found!('GPG Key') unless key
+
+        key.revoke
+        status :accepted
+      end
+
+      desc 'Delete a GPG key from the currently authenticated user' do
+        detail 'This feature was added in GitLab 10.0'
+      end
+      params do
+        requires :key_id, type: Integer, desc: 'The ID of the SSH key'
+      end
+      delete 'gpg_keys/:key_id' do
+        key = current_user.gpg_keys.find_by(id: params[:key_id])
+        not_found!('GPG Key') unless key
+
+        status 204
+        key.destroy
+      end
+
       desc "Get the currently authenticated user's email addresses" do
         success Entities::Email
       end
diff --git a/spec/requests/api/users_spec.rb b/spec/requests/api/users_spec.rb
index 5fef4437997..37cb95a16e3 100644
--- a/spec/requests/api/users_spec.rb
+++ b/spec/requests/api/users_spec.rb
@@ -4,6 +4,7 @@ describe API::Users do
   let(:user)  { create(:user) }
   let(:admin) { create(:admin) }
   let(:key) { create(:key, user: user) }
+  let(:gpg_key) { create(:gpg_key, user: user) }
   let(:email) { create(:email, user: user) }
   let(:omniauth_user) { create(:omniauth_user) }
   let(:ldap_user) { create(:omniauth_user, provider: 'ldapmain') }
@@ -753,6 +754,164 @@ describe API::Users do
     end
   end
 
+  describe 'POST /users/:id/keys' do
+    before do
+      admin
+    end
+
+    it 'does not create invalid GPG key' do
+      post api("/users/#{user.id}/gpg_keys", admin)
+
+      expect(response).to have_http_status(400)
+      expect(json_response['error']).to eq('key is missing')
+    end
+
+    it 'creates GPG key' do
+      key_attrs = attributes_for :gpg_key
+      expect do
+        post api("/users/#{user.id}/gpg_keys", admin), key_attrs
+
+        expect(response).to have_http_status(201)
+      end.to change { user.gpg_keys.count }.by(1)
+    end
+
+    it 'returns 400 for invalid ID' do
+      post api('/users/999999/gpg_keys', admin)
+
+      expect(response).to have_http_status(400)
+    end
+  end
+
+  describe 'GET /user/:id/gpg_keys' do
+    before do
+      admin
+    end
+
+    context 'when unauthenticated' do
+      it 'returns authentication error' do
+        get api("/users/#{user.id}/gpg_keys")
+
+        expect(response).to have_http_status(401)
+      end
+    end
+
+    context 'when authenticated' do
+      it 'returns 404 for non-existing user' do
+        get api('/users/999999/gpg_keys', admin)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq('404 User Not Found')
+      end
+
+      it 'returns 404 error if key not foud' do
+        delete api("/users/#{user.id}/gpg_keys/42", admin)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq('404 GPG Key Not Found')
+      end
+
+      it 'returns array of GPG keys' do
+        user.gpg_keys << gpg_key
+        user.save
+
+        get api("/users/#{user.id}/gpg_keys", admin)
+
+        expect(response).to have_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.first['key']).to eq(gpg_key.key)
+      end
+    end
+  end
+
+  describe 'DELETE /user/:id/gpg_keys/:key_id' do
+    before do
+      admin
+    end
+
+    context 'when unauthenticated' do
+      it 'returns authentication error' do
+        delete api("/users/#{user.id}/keys/42")
+
+        expect(response).to have_http_status(401)
+      end
+    end
+
+    context 'when authenticated' do
+      it 'deletes existing key' do
+        user.gpg_keys << gpg_key
+        user.save
+
+        expect do
+          delete api("/users/#{user.id}/gpg_keys/#{gpg_key.id}", admin)
+
+          expect(response).to have_http_status(204)
+        end.to change { user.gpg_keys.count }.by(-1)
+      end
+
+      it 'returns 404 error if user not found' do
+        user.keys << key
+        user.save
+
+        delete api("/users/999999/gpg_keys/#{gpg_key.id}", admin)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq('404 User Not Found')
+      end
+
+      it 'returns 404 error if key not foud' do
+        delete api("/users/#{user.id}/gpg_keys/42", admin)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq('404 GPG Key Not Found')
+      end
+    end
+  end
+
+  describe 'POST /user/:id/gpg_keys/:key_id/revoke' do
+    before do
+      admin
+    end
+
+    context 'when unauthenticated' do
+      it 'returns authentication error' do
+        post api("/users/#{user.id}/gpg_keys/42/revoke")
+
+        expect(response).to have_http_status(401)
+      end
+    end
+
+    context 'when authenticated' do
+      it 'revokes existing key' do
+        user.gpg_keys << gpg_key
+        user.save
+
+        expect do
+          post api("/users/#{user.id}/gpg_keys/#{gpg_key.id}/revoke", admin)
+
+          expect(response).to have_http_status(:accepted)
+        end.to change { user.gpg_keys.count }.by(-1)
+      end
+
+      it 'returns 404 error if user not found' do
+        user.gpg_keys << gpg_key
+        user.save
+
+        post api("/users/999999/gpg_keys/#{gpg_key.id}/revoke", admin)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq('404 User Not Found')
+      end
+
+      it 'returns 404 error if key not foud' do
+        post api("/users/#{user.id}/gpg_keys/42/revoke", admin)
+
+        expect(response).to have_http_status(404)
+        expect(json_response['message']).to eq('404 GPG Key Not Found')
+      end
+    end
+  end
+
   describe "POST /users/:id/emails" do
     before do
       admin
@@ -1153,6 +1312,173 @@ describe API::Users do
     end
   end
 
+  describe 'GET /user/gpg_keys' do
+    context 'when unauthenticated' do
+      it 'returns authentication error' do
+        get api('/user/gpg_keys')
+
+        expect(response).to have_http_status(401)
+      end
+    end
+
+    context 'when authenticated' do
+      it 'returns array of GPG keys' do
+        user.gpg_keys << gpg_key
+        user.save
+
+        get api('/user/gpg_keys', user)
+
+        expect(response).to have_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.first['key']).to eq(gpg_key.key)
+      end
+
+      context 'scopes' do
+        let(:path) { '/user/gpg_keys' }
+        let(:api_call) { method(:api) }
+
+        include_examples 'allows the "read_user" scope'
+      end
+    end
+  end
+
+  describe 'GET /user/gpg_keys/:key_id' do
+    it 'returns a single key' do
+      user.gpg_keys << gpg_key
+      user.save
+
+      get api("/user/gpg_keys/#{gpg_key.id}", user)
+
+      expect(response).to have_http_status(200)
+      expect(json_response['key']).to eq(gpg_key.key)
+    end
+
+    it 'returns 404 Not Found within invalid ID' do
+      get api('/user/gpg_keys/42', user)
+
+      expect(response).to have_http_status(404)
+      expect(json_response['message']).to eq('404 GPG Key Not Found')
+    end
+
+    it "returns 404 error if admin accesses user's GPG key" do
+      user.gpg_keys << gpg_key
+      user.save
+
+      get api("/user/gpg_keys/#{gpg_key.id}", admin)
+
+      expect(response).to have_http_status(404)
+      expect(json_response['message']).to eq('404 GPG Key Not Found')
+    end
+
+    it 'returns 404 for invalid ID' do
+      get api('/users/gpg_keys/ASDF', admin)
+
+      expect(response).to have_http_status(404)
+    end
+
+    context 'scopes' do
+      let(:path) { "/user/gpg_keys/#{gpg_key.id}" }
+      let(:api_call) { method(:api) }
+
+      include_examples 'allows the "read_user" scope'
+    end
+  end
+
+  describe 'POST /user/gpg_keys' do
+    it 'creates a GPG key' do
+      key_attrs = attributes_for :gpg_key
+      expect do
+        post api('/user/gpg_keys', user), key_attrs
+
+        expect(response).to have_http_status(201)
+      end.to change { user.gpg_keys.count }.by(1)
+    end
+
+    it 'returns a 401 error if unauthorized' do
+      post api('/user/gpg_keys'), key: 'some key'
+
+      expect(response).to have_http_status(401)
+    end
+
+    it 'does not create GPG key without key' do
+      post api('/user/gpg_keys', user)
+
+      expect(response).to have_http_status(400)
+      expect(json_response['error']).to eq('key is missing')
+    end
+  end
+
+  describe 'POST /user/gpg_keys/:key_id/revoke' do
+    it 'revokes existing GPG key' do
+      user.gpg_keys << gpg_key
+      user.save
+
+      expect do
+        post api("/user/gpg_keys/#{gpg_key.id}/revoke", user)
+
+        expect(response).to have_http_status(:accepted)
+      end.to change { user.gpg_keys.count}.by(-1)
+    end
+
+    it 'returns 404 if key ID not found' do
+      post api('/user/gpg_keys/42/revoke', user)
+
+      expect(response).to have_http_status(404)
+      expect(json_response['message']).to eq('404 GPG Key Not Found')
+    end
+
+    it 'returns 401 error if unauthorized' do
+      user.gpg_keys << gpg_key
+      user.save
+
+      post api("/user/gpg_keys/#{gpg_key.id}/revoke")
+
+      expect(response).to have_http_status(401)
+    end
+
+    it 'returns a 404 for invalid ID' do
+      post api('/users/gpg_keys/ASDF/revoke', admin)
+
+      expect(response).to have_http_status(404)
+    end
+  end
+
+  describe 'DELETE /user/gpg_keys/:key_id' do
+    it 'deletes existing GPG key' do
+      user.gpg_keys << gpg_key
+      user.save
+
+      expect do
+        delete api("/user/gpg_keys/#{gpg_key.id}", user)
+
+        expect(response).to have_http_status(204)
+      end.to change { user.gpg_keys.count}.by(-1)
+    end
+
+    it 'returns 404 if key ID not found' do
+      delete api('/user/gpg_keys/42', user)
+
+      expect(response).to have_http_status(404)
+      expect(json_response['message']).to eq('404 GPG Key Not Found')
+    end
+
+    it 'returns 401 error if unauthorized' do
+      user.gpg_keys << gpg_key
+      user.save
+
+      delete api("/user/gpg_keys/#{gpg_key.id}")
+
+      expect(response).to have_http_status(401)
+    end
+
+    it 'returns a 404 for invalid ID' do
+      delete api('/users/gpg_keys/ASDF', admin)
+
+      expect(response).to have_http_status(404)
+    end
+  end
+
   describe "GET /user/emails" do
     context "when unauthenticated" do
       it "returns authentication error" do