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Show HN: Givemeguid.com – CLI/curl friendly GUIDs
- deweyair 6y agoInstructions are in the headers. Query string params for returning multiple GUIDs, and optionally returning JSON.
- nonoesp 6y ago- https://www.givemeguid.com/?json=1 https://www.givemeguid.com/?json=1 - https://www.givemeguid.com/?number=5 https://www.givemeguid.com/?number=5
- tkfu 6y agoI'm having trouble imagining who would want to use this. What's the environment where you would have curl and a need for generating UUIDs, but wouldn't have access to uuidgen or similar?
- p4bl0 6y agoThis, and also, are GUID that pose a problem with CLI/curl really a thing?
- MrGilbert 6y agoMaybe a JS App which is made completely out of third party APIs, without anything self-hosted? Not discussing wether this is a good idea or not, though... I was surprised to see that there is no "built-in" mechanism in JS to generate a GUID. As a C# dev, I'm used to Guid.NewGuid()
- hombre_fatal 6y agoWhy would you make an http request if you can just google a 3-line JS solution? You're just generating a large random number and formatting it as a UUID. https://gist.github.com/jed/982883 https://gist.github.com/jed/982883 If you google "generate uuid javascript" you can find approaches from Math.random to node/browser `crypto` module to shelling out OS random. One of the main benefits of guid generation is that you don't need to synchronize with anything to generate a unique ID, so it's weird to incur an http request, especially to someone else's service. At that point you might as well just phone home to your own service.
- sk0g 6y agoUUIDs also have a hashed namespace in them, don't they? Not sure if that version implements them.
- hombre_fatal 6y agoOnly uuid v3/v5. Anything is possible if that's what you want. But 128 (or 122) bits of random are usually what you want when you think of guid. Most people format 128-bit random numbers into a UUID just so it's obvious at a glance what it is: a guid. Even if it's not technically a UUIDv4 because it doesn't have the magic bits.
- tatersolid 6y agoJavaScript Math.random() should never be used for UUID generation. You will get collisions even at small scale. window.crypto.getRandomValues() should be used instead. The quality and seeding of Math.random() is implementation-dependent and not generally good enough everywhere to prevent collisions. Many seed with the just the system time. Source: I have personally seen such collisions in a production web app with 700k users. A Web search for “Javacsript GUID collision” shows that many others have as well. We switched to the cryptographic generator and the collisions disappeared.
- ubanholzer 6y agoIf a programmer isn't able to code a GUID generator and uses a HTTP request instead, he really shouldn't code.
- raxxorrax 6y agoDepends on the GUID. Some of them include version numbers, timestamps etc... I would need to code the http request too. The problem with web services is that they might disappear again, so I would maybe use it on a website, but not for production software.
- trashburger 6y agoIn what world is it safe to rely on an external service to provide GUIDs for you? Where's the guarantee that the service won't one day start manipulating GUIDs? Now you have a major attack vector.
- berkes 6y ago> major attack vector That seems hyperbolic to me. If you rely on UUID for security, it seems, to me, something is wrong in your architecture and the security flaw lies there. When would you, legitimate, rely on GUID/UUID for security?
- speedgoose 6y agoYou can use the UUID v4 as a secret I guess.
- oefrha 6y agoYou can totally use uuid4 as password reset tokens, and they could be slightly nicer than random urlsafe strings for your database, provided they’re generated securely, not from givemeguid.com.
- deleted 6y ago[deleted]
- gitgud 6y agoQuick GUID's in JavaScript Math.random().toString(32).slice(2,10) Gives you an 8 character GUID.... but maybe don't use it for anything important....
- kelnos 6y agoYeah, I'm just really confused. If you're at a CLI, you probably have uuidgen. And I'd assume there's something similar on Windows. If you're writing some kind of application, pretty much every language/framework can generate UUIDs, and even if yours doesn't, just generate a 128-bit number, stamp the v4 UUID bits into it, reformat it, and you're done. Calling out to a 3rd-party service is insane for that use case anyway.
- jcelerier 6y ago> Yeah, I'm just really confused. If you're at a CLI, you probably have uuidgen. And I'd assume there's something similar on Windows. uuidgen is provided by the Windows SDK - exactly the same usage than in *nix
- deweyair 6y agoUnderstandable! I made it for the few times I'm manually testing an API using Swagger or something similar and need a valid(ish) GUID to stand in for some field being sent to the api. There's no shortage of ways to generate GUIDs, that's for sure!
- fyfy18 6y agoMaybe a NPM module for generating UUIDs? /s
- GoblinSlayer 6y agoI will just leave it here: https://www.uuidgenerator.net/api https://www.uuidgenerator.net/api
- huhtenberg 6y agoAnd why would you do that?
- pricechild 6y agoIt looks very relevant and has more features?
- huhtenberg 6y agoWell, yeah, of course. The link itself is fine, it's the remark next to it that I find to be in poor taste and uncalled for.
- redact207 6y agoThanks I'll probably use this. I often want to get a static uuid - usually for adding as static data in a test.
- speedgoose 6y agoIf you use Linux: cat /proc/sys/kernel/random/uuid
- aranw 6y agoThis doesn't work on macOS :( cat: /proc/sys/kernel/random/uuid: No such file or directory
- deleted 6y ago[deleted]
- speedgoose 6y agoI edited, it's a Linux feature.
- shean_massey 6y agoTIL something new, thanks!
- thinkingkong 6y agoIf you need a unique identifier on the command line there are a few ways to do it. uuidgen is one. My personal favorite is this snippet. $ id=$(openssl rand 1000 | openssl sha1) && printf "%s${id:0:8}\n"
- mormegil 6y agoWhy would you want to hash random bytes? The only thing you could theoretically achieve by that would be decreasing entropy. Just do openssl rand -hex 20 (or any other number of bytes as needed, or -base64 for another encoding).
- aranw 6y agoNice! I think this will still have a use and is a nice addition to add another alternative way to generate uuids I use the following alias to generate uuids function uuid() { uuidgen | tr "[:upper:]" "[:lower:]" | tr -d "\n\r" } I then pair it with pbcopy on the mac uuidgen | pbcopy
- jcelerier 6y agoone of my most used non-trivial shell commands must be uuidgen | awk '{ printf "\"" $1 "\"" }' | xclip -selection clipboard
- politelemon 6y agoI remember several years ago using https://newguid.com https://newguid.com which was pretty much the same thing - no page furniture, just the new guid. Sadly the domain seems to be on sale now! There's also https://www.newguid.org/ https://www.newguid.org/
- berkes 6y ago> Sadly the domain seems to be on sale now! Which is a perfect example why it is bad to rely on a service like this to generate your IDs. What if I bought it and started emitting predictable IDs? Or non-unique IDs?
- queuep 6y agoThis is what I use to generate guids with autohotkey: ::;guid:: guid := GUID() StringLower, guid, guid Clipboard := guid SendInput,^v return GUID() { format = %A_FormatInteger% ; save original integer format SetFormat Integer, Hex ; for converting bytes to hex VarSetCapacity(A,16) DllCall("rpcrt4\UuidCreate","Str",A) Address := &A Loop 16 { x := 256 + *Address ; get byte in hex, set 17th bit StringTrimLeft x, x, 3 ; remove 0x1 h = %x%%h% ; in memory: LS byte first Address++ } SetFormat Integer, %format% ; restore original format h := SubStr(h,1,8) . "-" . SubStr(h,9,4) . "-" . SubStr(h,13,4) . "-" . SubStr(h,17,4) . "-" . SubStr(h,21,12) return h }
- antiufo 6y agoOr from PowerShell: [Guid]::NewGuid()
- aloisdg 6y agoI made one for fun (and as a QA exercise for my GF): https://aloisdegouvello.gitlab.io/guid/ https://aloisdegouvello.gitlab.io/guid/ GUID as a service. What a time to be alive :)
- patricjansson 6y agoUsage information in response headers, me like :)
- deweyair 6y agoThanks!
- raxxorrax 6y agoIs this just a "random" UUID or does it meet specs of RFC 4122? I have seen countless times when it was just generated as {8}-{4}-{4}-{4}-{12} with complete random numbers. Well, works for most applications...
- plasma 6y agoIf you use Visual Studio, typing the word (with quotes) “nguid” in the code IDE generates one for you.
- deweyair 6y agoI spend a fair amount of my day in Visual Studio and didn't know this, thanks!
- deleted 6y ago[deleted]
- santiagobasulto 6y agoI have uuidgen in my Mac, but also have a tiny alias: alias uuid='python -c "import uuid;print(str(uuid.uuid4()))"'
- deleted 6y ago[deleted]