diff --git a/.gitignore b/.gitignore
index 0307a32..43d0d51 100644
--- a/.gitignore
+++ b/.gitignore
@@ -94,8 +94,12 @@ typings/
 
 # End of https://www.gitignore.io/api/node
 
+# env dile
 .envrc
+
+# photo, video file
 *.png
 *.jpeg
 *.jpg
-hls/
\ No newline at end of file
+*.m3u8
+*.ts
diff --git a/README.md b/README.md
index e464ac0..bc608f5 100644
--- a/README.md
+++ b/README.md
@@ -56,8 +56,11 @@ ngrok で得られる URL はは変動するので，[API Gateway](https://aws.a
  │   └─ GET
  ├─ /photo-viewer
  │   └─ GET
+ ├─ /slack
+ │   └ /{path+}
+ │      ├─ GET
+ │      └─ POST
  ├─ /stream
- │   ├─ GET
  │   └ /{file+}
  │      └─ GET
  └─ /viewer
@@ -77,6 +80,19 @@ Bot User メニューにて Redirect URLs は
 `https://[RESOURCE_ID].execute-api.[REGION].amazonaws.com/prod/oauth-redirect`のみに設定し，
 Scopes に`identity.basic`を追加してください。
 
+### Slack bot
+
+[Slash Commands](https://api.slack.com/slash-commands)に従い slack api ページにて，  
+Command: `/bushitsu-photo`  
+Request URL: `https://[AWS_REST_API_ID].execute-api.[REGION].amazonaws.com/prod/slack/photo`  
+Escape channels, users, and links sent to your app を有効  
+に設定します。
+
+### Slack interactive message
+
+[Making messages interactive](https://api.slack.com/interactive-messages) に従い設定します。
+Request URL は`https://[AWS_REST_API_ID].execute-api.[REGION].amazonaws.com/prod/slack/actions/`を設定してください。
+
 ### 環境変数
 
 `NGROK_TOKEN`: Tunnel Authtoken, 無料プランでプランでも動作します
@@ -86,6 +102,13 @@ Scopes に`identity.basic`を追加してください。
 `SLACK_CLIENT_ID`: Slack Apps の Client ID  
 `SLACK_CLIENT_SECRET`: Slack Apps の Client Secret
 
+`SLACK_BOT_ACCESS_TOKEN`: Slack Apps の OAuth Access Token  
+`SLACK_SIGNING_SECRET`: Slack Apps の Signing Secret
+
+`CONTACT_CHANNEL`: Slack でのメッセージにのせる問い合せ先の channel ID
+
+> 参考: [Formatting text in messages](https://api.slack.com/messaging/composing/formatting#linking-channels)
+
 `LIVE_PRIVATE_KEY`: live streaming に認証をかけるための key, 暗に用いるので頑強であれば何でも良い
 
 `WORKSTATION_ID`: Slack の WorkSpace の ID
@@ -98,11 +121,19 @@ export AWS_REST_API_ID="h7c..."
 export SLACK_CLIENT_ID="179..."
 export SLACK_CLIENT_SECRET="38b..."
 
+export SLACK_BOT_ACCESS_TOKEN="xoxb-3814..."
+export SLACK_SIGNING_SECRET="fb36..."
+
+export CONTACT_CHANNEL="JCP..."
+
 export PRIVATE_KEY="presetprivatekey"
 
 export WORKSTATION_ID="VOW38CP2D"
 ```
 
+> `IS_MAC`, `DEBUG` この２つの変数で flag を立てることもできます
+> `true`, `false`, `0`, `1` で指定可能です。
+
 [direnv](https://direnv.net/)なら以上のように設定されているはずです。
 
 ## ffmpeg
diff --git a/app.js b/app.js
index 4281bd2..1517e82 100644
--- a/app.js
+++ b/app.js
@@ -4,6 +4,7 @@ const Server = require('./server');
 const aws = require('./aws');
 const Stream = require('./stream');
 const { daemon } = require('./utils');
+const slack = require('./slack');
 
 const config = {
   restApiId: process.env.AWS_REST_API_ID,
@@ -13,10 +14,13 @@ const config = {
   ngrokToken: process.env.NGROK_TOKEN,
   slackClientId: process.env.SLACK_CLIENT_ID,
   slackClientSecret: process.env.SLACK_CLIENT_SECRET,
+  slackBotAccessToken: process.env.SLACK_BOT_ACCESS_TOKEN,
+  slackSigningSecret: process.env.SLACK_SIGNING_SECRET,
+  contactChannel: process.env.CONTACT_CHANNEL,
   wsId: process.env.WORKSTATION_ID,
   privateKey: process.env.PRIVATE_KEY,
-  debug: Boolean(process.env.DEBUG),
-  isMac: Boolean(process.env.IS_MAC),
+  debug: process.env.DEBUG && Boolean(JSON.parse(process.env.DEBUG)),
+  isMac: process.env.IS_MAC && Boolean(JSON.parse(process.env.IS_MAC)),
 };
 
 const liveServer = new RtmpServer(1935);
@@ -36,14 +40,13 @@ disk
     console.log(`Please put HLS files in ${mountPath}`);
     let input;
     if (config.isMac) {
-      input = 'ffmpeg -f avfoundation -framerate 30 -re -i 0 -r 10';
+      input = 'ffmpeg -f avfoundation -re -i 0 -r 10';
     } else {
       input = 'ffmpeg -i /dev/video0';
     }
     daemon(
       `${input} -vcodec libx264 -pix_fmt yuv420p -preset veryfast -tune zerolatency,stillimage,film -vb 2500k -vf "drawtext=text='%{localtime}':fontcolor=white@0.8:x=0:y=h-lh*1.2:fontsize=24" -f flv rtmp://localhost:${1935}/live/bushitsuchan`,
     );
-
     daemon(
       `ffmpeg -i rtmp://localhost:1935/live/bushitsuchan -hls_flags delete_segments -g 40 -f hls ${mountPath}/output.m3u8`,
     );
@@ -69,6 +72,16 @@ disk
       config,
       `rtmp://localhost:1935/live/${'bushitsuchan'}`,
     );
+    server.app.use(
+      '/slack',
+      slack(
+        awsUrl,
+        config.contactChannel,
+        `rtmp://localhost:${1935}/live/bushitsuchan`,
+        config.slackBotAccessToken,
+        config.slackSigningSecret,
+      ),
+    );
     server.run(3000).then(() => console.log(`Express app listening on port ${3000}`));
   })
   .catch((e) => {
diff --git a/aws.js b/aws.js
index 8ea578e..830e680 100644
--- a/aws.js
+++ b/aws.js
@@ -4,30 +4,38 @@ const util = require('util');
 const exec = util.promisify(childProcess.exec);
 
 module.exports.run = async (config, url) => {
-  exec(`aws apigateway get-resources --rest-api-id ${config.restApiId}`)
-    .then((result) => {
-      const { stdout } = result;
-      return JSON.parse(stdout);
-    })
-    .then(resources => Promise.all(
-      resources.items.map((item) => {
-        let command = `aws apigateway put-integration --rest-api-id ${config.restApiId} --resource-id ${item.id} --http-method GET --type HTTP_PROXY --integration-http-method GET`;
-        command += ` --uri ${url}${item.path.replace(/{([^}+]+)\+}/, '{$1}')}`;
-        const isMatch = item.path.match(/{([^}+]+)\+}/);
+  const resources = await exec(
+    `aws apigateway get-resources --rest-api-id ${config.restApiId}`,
+  ).then((result) => {
+    const { stdout } = result;
+    return JSON.parse(stdout);
+  });
+  const commands = [];
+
+  resources.items.forEach((resource) => {
+    if (!resource.resourceMethods) {
+      return;
+    }
+    Array.prototype.push.apply(
+      commands,
+      Object.keys(resource.resourceMethods).map((method) => {
+        let command = `aws apigateway put-integration --rest-api-id ${config.restApiId} --resource-id ${resource.id} --http-method ${method} --type HTTP_PROXY --integration-http-method ${method}`;
+        command += ` --uri ${url}${resource.path.replace(/{([^}+]+)\+}/, '{$1}')}`;
+        const isMatch = resource.path.match(/{([^}+]+)\+}/);
         if (isMatch) {
           command += ` --request-parameters integration.request.path.${
             isMatch[1]
           }=method.request.path.${isMatch[1]}`;
         }
-        return exec(command);
+        return command;
       }),
-    ))
-    .then(() => {
-      exec(`aws apigateway create-deployment --rest-api-id ${config.restApiId} --stage-name prod`);
-    })
-    .catch((e) => {
-      console.error(e);
-    });
+    );
+  });
+  await Promise.all(commands.map(command => exec(command)));
+
+  await exec(
+    `aws apigateway create-deployment --rest-api-id ${config.restApiId} --stage-name prod`,
+  );
 
   const region = await exec('aws configure get region').then((result) => {
     const { stdout } = result;
diff --git a/block_template.json b/block_template.json
new file mode 100644
index 0000000..4cf6f63
--- /dev/null
+++ b/block_template.json
@@ -0,0 +1,104 @@
+[
+  {
+    "type": "image",
+    "title": {
+      "type": "plain_text",
+      "text": "部室の写真"
+    },
+    "image_url": "${photo_image}",
+    "alt_text": "部室の写真"
+  },
+  {
+    "type": "actions",
+    "block_id": "action_block",
+    "elements": [
+      {
+        "type": "button",
+        "text": {
+          "type": "plain_text",
+          "text": "削除"
+        },
+        "value": "delete",
+        "action_id": "delete_button",
+        "style": "danger",
+        "confirm": {
+          "title": {
+            "type": "plain_text",
+            "text": "メッセージ削除"
+          },
+          "text": {
+            "type": "plain_text",
+            "text": "削除しますか?"
+          },
+          "confirm": {
+            "type": "plain_text",
+            "text": "削除実行"
+          },
+          "deny": {
+            "type": "plain_text",
+            "text": "キャンセル"
+          }
+        }
+      } /** ,
+      {
+        "type": "overflow",
+        "options": [
+          {
+            "text": {
+              "type": "plain_text",
+              "text": "slection1"
+            },
+            "value": "slection1"
+          },
+          {
+            "text": {
+              "type": "plain_text",
+              "text": "slection2"
+            },
+            "value": "slection2"
+          }
+        ],
+        "action_id": "overflow"
+      } */
+    ]
+  },
+  {
+    "type": "context",
+    "elements": [
+      {
+        "type": "mrkdwn",
+        "text": "${expired-time}"
+      }
+    ]
+  },
+  {
+    "type": "divider"
+  },
+
+  {
+    "type": "context",
+    "elements": [
+      {
+        "type": "mrkdwn",
+        "text": "📷 View photo with `/bushitsu-photo`"
+      }
+    ]
+  },
+  {
+    "type": "context",
+    "elements": [
+      {
+        "type": "mrkdwn",
+        "text": "<${viewer-url}|WEB-配信動画版>"
+      },
+      {
+        "type": "mrkdwn",
+        "text": "<${photo-viewer-url}|WEB-画像版>"
+      },
+      {
+        "type": "mrkdwn",
+        "text": "*問い合せ*: <#${contact-channel}>"
+      }
+    ]
+  }
+]
diff --git a/package-lock.json b/package-lock.json
index 7beb512..5be108e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,11 +24,106 @@
         "js-tokens": "^4.0.0"
       }
     },
+    "@slack/interactive-messages": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@slack/interactive-messages/-/interactive-messages-1.1.1.tgz",
+      "integrity": "sha512-FIyj/sBmCjQ4B4Tt1z6MNdFmgvyT5CK2U2VrWGcdqdynxQk8tlN/AA/C0SSc5wIr/WNYck1c90ZawQJTlw3YsQ==",
+      "requires": {
+        "axios": "^0.18.0",
+        "debug": "^3.1.0",
+        "lodash.isfunction": "^3.0.9",
+        "lodash.isplainobject": "^4.0.6",
+        "lodash.isregexp": "^4.0.1",
+        "lodash.isstring": "^4.0.1",
+        "raw-body": "^2.3.3",
+        "tsscmp": "^1.0.6"
+      },
+      "dependencies": {
+        "axios": {
+          "version": "0.18.1",
+          "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.1.tgz",
+          "integrity": "sha512-0BfJq4NSfQXd+SkFdrvFbG7addhYSBA2mQwISr46pD6E5iqkWg02RAs8vyTT/j0RTnoYmeXauBuSv1qKwR179g==",
+          "requires": {
+            "follow-redirects": "1.5.10",
+            "is-buffer": "^2.0.2"
+          }
+        }
+      }
+    },
+    "@slack/logger": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@slack/logger/-/logger-1.0.0.tgz",
+      "integrity": "sha512-QDYhQR/58xKfB5iquvQwfpxPsmKPP/5SuDp8hRhZeUluCHsP1qBCOc3sW2Xb3cydxK0PAEnkLbBJf/ezsGwtlA==",
+      "requires": {
+        "@types/node": ">=8.9.0"
+      }
+    },
+    "@slack/types": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@slack/types/-/types-1.0.0.tgz",
+      "integrity": "sha512-IktC4uD/CHfLQcSitKSmjmRu4a6+Nf/KzfS6dTgUlDzENhh26l8aESKAuIpvYD5VOOE6NxDDIAdPJOXBvUGxlg=="
+    },
+    "@slack/web-api": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@slack/web-api/-/web-api-5.0.1.tgz",
+      "integrity": "sha512-L2Nc8P+NjXH1yqnsNhqxsrbpW3Qv+//9X5PQqcM3bctDmvmwTuhuM1X208RVD2avhnC89aghY5PssyaayWj5sA==",
+      "requires": {
+        "@slack/logger": "^1.0.0",
+        "@slack/types": "^1.0.0",
+        "@types/form-data": "^2.2.1",
+        "@types/is-stream": "^1.1.0",
+        "@types/node": ">=8.9.0",
+        "@types/p-queue": "^2.3.2",
+        "axios": "^0.18.0",
+        "eventemitter3": "^3.1.0",
+        "form-data": "^2.3.3",
+        "is-stream": "^1.1.0",
+        "p-queue": "^2.4.2",
+        "p-retry": "^4.0.0"
+      },
+      "dependencies": {
+        "axios": {
+          "version": "0.18.1",
+          "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.1.tgz",
+          "integrity": "sha512-0BfJq4NSfQXd+SkFdrvFbG7addhYSBA2mQwISr46pD6E5iqkWg02RAs8vyTT/j0RTnoYmeXauBuSv1qKwR179g==",
+          "requires": {
+            "follow-redirects": "1.5.10",
+            "is-buffer": "^2.0.2"
+          }
+        }
+      }
+    },
+    "@types/form-data": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/@types/form-data/-/form-data-2.5.0.tgz",
+      "integrity": "sha512-23/wYiuckYYtFpL+4RPWiWmRQH2BjFuqCUi2+N3amB1a1Drv+i/byTrGvlLwRVLFNAZbwpbQ7JvTK+VCAPMbcg==",
+      "requires": {
+        "form-data": "*"
+      }
+    },
+    "@types/is-stream": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@types/is-stream/-/is-stream-1.1.0.tgz",
+      "integrity": "sha512-jkZatu4QVbR60mpIzjINmtS1ZF4a/FqdTUTBeQDVOQ2PYyidtwFKr0B5G6ERukKwliq+7mIXvxyppwzG5EgRYg==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/node": {
       "version": "8.10.51",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-8.10.51.tgz",
       "integrity": "sha512-cArrlJp3Yv6IyFT/DYe+rlO8o3SIHraALbBW/+CcCYW/a9QucpLI+n2p4sRxAvl2O35TiecpX2heSZtJjvEO+Q=="
     },
+    "@types/p-queue": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/@types/p-queue/-/p-queue-2.3.2.tgz",
+      "integrity": "sha512-eKAv5Ql6k78dh3ULCsSBxX6bFNuGjTmof5Q/T6PiECDq0Yf8IIn46jCyp3RJvCi8owaEmm3DZH1PEImjBMd/vQ=="
+    },
+    "@types/retry": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/@types/retry/-/retry-0.12.0.tgz",
+      "integrity": "sha512-wWKOClTTiizcZhXnPY4wikVAwmdYHp8q6DmC+EJUzAMsycb7HB32Kh9RN4+0gExjmPmZSAQjgURXIGATPegAvA=="
+    },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -322,6 +417,17 @@
         "delayed-stream": "~1.0.0"
       }
     },
+    "comment-json": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/comment-json/-/comment-json-2.1.0.tgz",
+      "integrity": "sha512-OcO+nJnUtp29j9SwHVcP/F8t/9piiOQj7APXTj75cK/qFAgX7PtGV31ullzwZbBwiA5Rmj25C32FaFgwcu1Uwg==",
+      "requires": {
+        "core-util-is": "^1.0.2",
+        "esprima": "^4.0.1",
+        "has-own-prop": "^2.0.0",
+        "repeat-string": "^1.6.1"
+      }
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -790,8 +896,7 @@
     "esprima": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
-      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
-      "dev": true
+      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A=="
     },
     "esquery": {
       "version": "1.0.1",
@@ -828,6 +933,11 @@
       "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
       "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
     },
+    "eventemitter3": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-3.1.2.tgz",
+      "integrity": "sha512-tvtQIeLVHjDkJYnzf2dgVMxfuSGJeM/7UCG17TT4EumTfNtF+0nebF/4zWOIkCreAbtNqhGEboB6BWrwqNaw4Q=="
+    },
     "expect-ct": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/expect-ct/-/expect-ct-0.2.0.tgz",
@@ -1122,6 +1232,11 @@
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
       "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="
     },
+    "has-own-prop": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/has-own-prop/-/has-own-prop-2.0.0.tgz",
+      "integrity": "sha512-Pq0h+hvsVm6dDEa8x82GnLSYHOzNDt7f0ddFa3FqcQlgzEiptPqL+XrOJNavjOzSYiYWIrgeVYYgGlLmnxwilQ=="
+    },
     "has-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.0.tgz",
@@ -1369,6 +1484,11 @@
         "has": "^1.0.1"
       }
     },
+    "is-stream": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
+      "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ="
+    },
     "is-symbol": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/is-symbol/-/is-symbol-1.0.2.tgz",
@@ -1494,6 +1614,26 @@
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
       "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw=="
     },
+    "lodash.isfunction": {
+      "version": "3.0.9",
+      "resolved": "https://registry.npmjs.org/lodash.isfunction/-/lodash.isfunction-3.0.9.tgz",
+      "integrity": "sha512-AirXNj15uRIMMPihnkInB4i3NHeb4iBtNg9WRWuK2o31S+ePwwNmDPaTL3o7dTJ+VXNZim7rFs4rxN4YU1oUJw=="
+    },
+    "lodash.isplainobject": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/lodash.isplainobject/-/lodash.isplainobject-4.0.6.tgz",
+      "integrity": "sha1-fFJqUtibRcRcxpC4gWO+BJf1UMs="
+    },
+    "lodash.isregexp": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/lodash.isregexp/-/lodash.isregexp-4.0.1.tgz",
+      "integrity": "sha1-4T5kezDNVZdSoEzZEghvr32hwws="
+    },
+    "lodash.isstring": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
+      "integrity": "sha1-1SfftUVuynzJu5XV2ur4i6VKVFE="
+    },
     "media-typer": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -1780,6 +1920,20 @@
         "p-limit": "^1.1.0"
       }
     },
+    "p-queue": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/p-queue/-/p-queue-2.4.2.tgz",
+      "integrity": "sha512-n8/y+yDJwBjoLQe1GSJbbaYQLTI7QHNZI2+rpmCDbe++WLf9HC3gf6iqj5yfPAV71W4UF3ql5W1+UBPXoXTxng=="
+    },
+    "p-retry": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/p-retry/-/p-retry-4.1.0.tgz",
+      "integrity": "sha512-oepllyG9gX1qH4Sm20YAKxg1GA7L7puhvGnTfimi31P07zSIj7SDV6YtuAx9nbJF51DES+2CIIRkXs8GKqWJxA==",
+      "requires": {
+        "@types/retry": "^0.12.0",
+        "retry": "^0.12.0"
+      }
+    },
     "p-try": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
@@ -2000,6 +2154,11 @@
       "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==",
       "dev": true
     },
+    "repeat-string": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz",
+      "integrity": "sha1-jcrkcOHIirwtYA//Sndihtp15jc="
+    },
     "request": {
       "version": "2.88.0",
       "resolved": "https://registry.npmjs.org/request/-/request-2.88.0.tgz",
@@ -2077,6 +2236,11 @@
         "signal-exit": "^3.0.2"
       }
     },
+    "retry": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/retry/-/retry-0.12.0.tgz",
+      "integrity": "sha1-G0KmJmoh8HQh0bC1S33BZ7AcATs="
+    },
     "rimraf": {
       "version": "2.6.3",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
@@ -2279,6 +2443,11 @@
       "resolved": "https://registry.npmjs.org/stealthy-require/-/stealthy-require-1.1.1.tgz",
       "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks="
     },
+    "store": {
+      "version": "2.0.12",
+      "resolved": "https://registry.npmjs.org/store/-/store-2.0.12.tgz",
+      "integrity": "sha1-jFNOKguDH3K3X8XxEZhXxE711ZM="
+    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -2434,6 +2603,11 @@
       "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
       "dev": true
     },
+    "tsscmp": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.6.tgz",
+      "integrity": "sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA=="
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
diff --git a/package.json b/package.json
index a900925..cd7fd6e 100644
--- a/package.json
+++ b/package.json
@@ -18,8 +18,12 @@
   },
   "homepage": "https://github.com/TUS-OSK/bushitsuchan-PC#readme",
   "dependencies": {
+    "@slack/interactive-messages": "^1.1.1",
+    "@slack/web-api": "^5.0.1",
     "axios": "^0.19.0",
+    "body-parser": "^1.19.0",
     "child_process": "^1.0.2",
+    "comment-json": "^2.1.0",
     "cookie-session": "^1.3.3",
     "cors": "^2.8.5",
     "express": "^4.17.1",
@@ -29,6 +33,7 @@
     "ngrok": "^3.2.3",
     "node-media-server": "^2.1.2",
     "rtmp-server": "^0.2.0",
+    "store": "^2.0.12",
     "util": "^0.12.1"
   },
   "devDependencies": {
diff --git a/server.js b/server.js
index 3c8f9fe..9655667 100644
--- a/server.js
+++ b/server.js
@@ -59,6 +59,23 @@ const authorize = async (token, workstationId) => {
   return result.data.user.name;
 };
 
+const resPhoto = (rtmpAddress, ext = 'jpg') => (req, res) => {
+  const ffmpeg = childProcess.spawn('ffmpeg', [
+    '-i',
+    `${rtmpAddress}`,
+    '-ss',
+    '0.7',
+    '-vframes',
+    '1',
+    '-f',
+    'image2',
+    'pipe:1',
+  ]);
+
+  res.contentType(`image/${ext}`);
+  ffmpeg.stdout.pipe(res);
+};
+
 module.exports = class {
   constructor(ngrokUrl, awsUrl, mountPath, config, rtmpAddress) {
     this.ngrokUrl = ngrokUrl;
@@ -80,7 +97,7 @@ module.exports = class {
       }),
     );
 
-    morgan.token('user', (req, res) => req.session.name || 'anonymous');
+    morgan.token('user', (req, res) => req.session && (req.session.name || 'anonymous'));
     this.app.use(
       morgan(
         '<@:user> [:date[clf]] :method :url :status :res[content-length] - :response-time ms',
@@ -211,24 +228,7 @@ module.exports = class {
 
     this.app.use('/stream', express.static(this.mountPath));
 
-    this.app.get('/photo.jpg', async (req, res) => {
-      const ext = 'jpeg';
-
-      const ffmpeg = childProcess.spawn('ffmpeg', [
-        '-i',
-        `${this.rtmpAddress}`,
-        '-ss',
-        '0.7',
-        '-vframes',
-        '1',
-        '-f',
-        'image2',
-        'pipe:1',
-      ]);
-
-      res.contentType(`image/${ext}`);
-      ffmpeg.stdout.pipe(res);
-    });
+    this.app.get('/photo.jpg', resPhoto(this.rtmpAddress));
   }
 
   async run(port = 3000) {
diff --git a/slack.js b/slack.js
new file mode 100644
index 0000000..f4de81d
--- /dev/null
+++ b/slack.js
@@ -0,0 +1,103 @@
+const express = require('express');
+const bodyParser = require('body-parser');
+const { WebClient } = require('@slack/web-api');
+const { createMessageAdapter } = require('@slack/interactive-messages');
+const store = require('store');
+const crypto = require('crypto');
+const expirePlugin = require('store/plugins/expire');
+const updatePlugin = require('store/plugins/update');
+const childProcess = require('child_process');
+const fs = require('fs');
+const commentJSON = require('comment-json');
+const { base64Encode, base64Decode } = require('./utils');
+
+store.addPlugin(expirePlugin);
+store.addPlugin(updatePlugin);
+
+module.exports = (awsUrl, contactChannel, rtmpAddress, slackBotAccessToken, slackSigningSecret) => {
+  const router = express.Router();
+  const web = new WebClient(slackBotAccessToken);
+  const slackInteractions = createMessageAdapter(slackSigningSecret);
+
+  router.use('/actions', slackInteractions.expressMiddleware());
+  slackInteractions.action({ type: 'button' }, (payload, respond) => {
+    const { actions, message, channel } = payload;
+    const { ts } = message;
+
+    if (actions[0].value === 'delete') {
+      web.chat.delete({ channel: channel.id, ts }).catch(e => console.error(e));
+    }
+  });
+
+  router.use(bodyParser.urlencoded({ extended: false }));
+  router.use(bodyParser.json());
+
+  router.post('/photo', (req, res) => {
+    const expired = new Date();
+    expired.setHours(expired.getHours() + 5);
+
+    const key = crypto
+      .createHash('md5')
+      .update(`${req.body.user_id}-${expired.getTime()}`)
+      .digest('Base64');
+
+    const ffmpeg = childProcess.spawn('ffmpeg', [
+      '-i',
+      `${rtmpAddress}`,
+      '-ss',
+      '0.7',
+      '-vframes',
+      '1',
+      '-f',
+      'image2',
+      'pipe:1',
+    ]);
+
+    const chunks = [];
+    ffmpeg.stdout.on('data', (chunk) => {
+      chunks.push(chunk);
+    });
+    ffmpeg.stdout.on('end', () => {
+      store.set(key, Buffer.concat(chunks), expired.getTime());
+      let template = fs.readFileSync('./block_template.json', 'utf8');
+      template = template.replace(
+        /\${photo_image}/g,
+        `${awsUrl}${req.baseUrl}/thumb.jpg?key=${base64Encode(key)}`,
+      );
+      template = template.replace(/\${viewer-url}/g, `${awsUrl}/viewer`);
+      template = template.replace(/\${photo-viewer-url}/g, `${awsUrl}/photo-viewer`);
+      template = template.replace(/\${contact-channel}/g, contactChannel);
+      template = template.replace(
+        /\${expired-time}/g,
+        `写真は<!date^${Math.floor(
+          expired.getTime() / 1000,
+        )}^{date_short_pretty}{time}まで有効です|${expired.toLocaleString()}まで有効です>`,
+      );
+      web.chat.postMessage({
+        channel: req.body.channel_id,
+        text: '部室の様子',
+        icon_emoji: ':slack:',
+        blocks: commentJSON.parse(template),
+      });
+    });
+
+    res.status(200).send('待ってね');
+  });
+
+  router.get('/thumb.jpg', (req, res) => {
+    const { key } = req.query;
+    if (!key) {
+      res.sendStatus(404).end();
+      return;
+    }
+    const chunks = store.get(base64Decode(key));
+    if (!chunks) {
+      res.sendStatus(204).end();
+      return;
+    }
+    res.contentType('image/jpg');
+    res.send(Buffer.from(chunks.data));
+  });
+
+  return router;
+};
diff --git a/utils.js b/utils.js
index c8961a8..034bc4f 100644
--- a/utils.js
+++ b/utils.js
@@ -2,7 +2,7 @@ const childProcess = require('child_process');
 const util = require('util');
 const fs = require('fs');
 
-const exec = util.promisify(childProcess.exec);
+module.exports.exec = util.promisify(childProcess.exec);
 
 const wait = ms => new Promise(reolve => setTimeout(() => reolve(), ms));
 
@@ -15,7 +15,7 @@ module.exports.daemon = async (command, ms = 1000 * 10, maxCount = 100) => {
   for (let i = 0; i < maxCount; i += 1) {
     try {
       // eslint-disable-next-line no-await-in-loop
-      await exec(command);
+      await module.exports.exec(command);
     } catch (e) {
       logger.error(e);
       // eslint-disable-next-line no-await-in-loop
@@ -23,3 +23,13 @@ module.exports.daemon = async (command, ms = 1000 * 10, maxCount = 100) => {
     }
   }
 };
+
+module.exports.base64Encode = str => str
+  .replace(/\+/g, '-')
+  .replace(/\//g, '_')
+  .replace(/=+$/, '');
+
+module.exports.base64Decode = (str) => {
+  const replaces = str.replace(/-/g, '+').replace(/_/g, '/');
+  return replaces + '='.repeat(4 - ((replaces.length % 4) % 4));
+};