Node-Red In Stock Item Notification Flow

Third party integrations Node-RED
1

Hello everyone, I wanted to share a quick Node-Red flow I came up with for an In-Stock Item notification. I was frustrated with online services like visualping that provide this as a service for quite a premium. Why would I pay for that when I have Home Assistant? This flow makes an HTTP Get request and then filters the returned HTML to read if the item is in stock. Once the button on the page says anything other than “Sold Out” it will send me an actionable notification that I can open a link to the product page for purchase. This code could easily be modified to suit a lot of needs. This worked great for me today as I have been trying to grab Unifi’s new G3 Instant Camera but it kept going out of stock. I now have one on order!!

I was asked to make a youtube video covering this so I figured I would link it here.
https://youtu.be/1Ta7JgzuWfI

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[{"id":"4c00655e.4cd224","type":"tab","label":"Camera InStock","disabled":false,"info":""},{"id":"fc7b44f9.391bb8","type":"http request","z":"4c00655e.4cd224","name":"","method":"GET","ret":"txt","paytoqs":"ignore","url":"https://store.ui.com/collections/unifi-protect/products/unifi-protect-g3-instant-camera","tls":"","persist":false,"proxy":"","authType":"","x":450,"y":40,"wires":[["7a1134fd.fb92fc"]]},{"id":"7a1134fd.fb92fc","type":"html","z":"4c00655e.4cd224","name":"Filter for Button","property":"payload","outproperty":"payload","tag":"button.btn.btn--full","ret":"html","as":"single","x":120,"y":120,"wires":[["f404a520.2188c8"]]},{"id":"d6736a4.4584f98","type":"change","z":"4c00655e.4cd224","name":"Add Header","rules":[{"t":"set","p":"headers","pt":"msg","to":"{\"user-agent\":\"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36\"}","tot":"json"}],"action":"","property":"","from":"","to":"","reg":false,"x":270,"y":40,"wires":[["fc7b44f9.391bb8"]]},{"id":"970059f3.da9168","type":"switch","z":"4c00655e.4cd224","name":"If not Sold Out","property":"payload","propertyType":"msg","rules":[{"t":"neq","v":"Sold Out","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":200,"y":180,"wires":[["28871717.7584a8"]]},{"id":"28871717.7584a8","type":"api-call-service","z":"4c00655e.4cd224","name":"Notification","server":"fc1437ec.ba4bd8","version":1,"debugenabled":false,"service_domain":"notify","service":"mobile_app_oneplus_a6013","entityId":"","data":"{\"title\":\"Camera In Stock\",\"message\":\"Wanna See?\",\"data\":{\"actions\":[{\"action\":\"URI\",\"title\":\"Open Product Page\",\"uri\":\"https://store.ui.com/collections/unifi-protect/products/unifi-protect-g3-instant-camera\"}]}}","dataType":"json","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":450,"y":180,"wires":[[]]},{"id":"a08995b1.977768","type":"debug","z":"4c00655e.4cd224","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":470,"y":120,"wires":[]},{"id":"f404a520.2188c8","type":"html","z":"4c00655e.4cd224","name":"Filter for Text","property":"payload[1]","outproperty":"payload","tag":"span.text","ret":"text","as":"multi","x":290,"y":120,"wires":[["a08995b1.977768","970059f3.da9168"]]},{"id":"c1edbabc.662608","type":"inject","z":"4c00655e.4cd224","name":"Start","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"60","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":90,"y":40,"wires":[["d6736a4.4584f98"]]},{"id":"fc1437ec.ba4bd8","type":"server","name":"Home Assistant","addon":true}]
2

Unfortunately, I could not get this code to work with any Costco items (using Costco URL). It works great with Best Buy.

3

I think I made some progress but have not been able to read the content of the page from Costco as you described. I started adding the following information to my header and got a readable response but it does not appear to have all of the needed content to parse. Please note you need to input a valid zip code if you put this code in the change node for the header.

Can someone assist me in getting the entire output from the debug node? It is truncating the returned HTML. Otherwise, I will look this up tomorrow.

{
    "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36",
    "cookie": "client-zip-short=<YOURZIPCODE>",
    "accept-language": "en-US,en;q=0.9",
    "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
    "accept-encoding": "deflate"
}
4

Thanks…I really appreciate your help.