Clojurians Log v2

Hi Guys, i'd like to connect clojure with google sheets. https://github.com/SparkFund/google-apps-clj Question is where should i put this in the project.clj ? [google-apps-clj "0.6.1"] is it under dependencies?

(defproject asdf "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "<http://example.com/FIXME>"
  :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
            :url "<https://www.eclipse.org/legal/epl-2.0/>"}
  :dependencies [[org.clojure/clojure "1.10.1"]]
  :main ^:skip-aot asdf.core
  :target-path "target/%s"
  :profiles {:uberjar {:aot :all
                       :jvm-opts ["-Dclojure.compiler.direct-linking=true"]}})

https://github.com/technomancy/leiningen/blob/stable/doc/TUTORIAL.md#artifact-ids-groups-and-versions

ooo thank you @pavlos :D

Hi, I'm taking a look at https://github.com/bbatsov/clojure-style-guide#nil-punning

;; good
(defn print-seq [s]
  (when (seq s)
    (prn (first s))
    (recur (rest s))))

;; bad
(defn print-seq [s]
  (when-not (empty? s)
    (prn (first s))
    (recur (rest s))))

It's not that it's bad or better, it's more idiomatic...

user=> (doc empty?)
-------------------------
clojure.core/empty?
([coll])
  Returns true if coll has no items - same as (not (seq coll)).
  Please use the idiom (seq x) rather than (not (empty? x))
nil
user=> 

The thing about seq is that it will return the collection, whereas empty? will simply return true or false

Also empty? is implemented as (not (seq coll)) so you're kinda doing a double negation.

:thumbsup:

Thanks!

@pavlos, ive tried to follow steps : Obtaining OAuth 2 Credentials but stuck at step 6, i've create the google-creds.edn, where should i save this?

you could use https://clojuredocs.org/clojure.core/not-empty if it helps with the reading, but has the same outputs as seq

whenever i called (edn/read-string (slurp "config/google-creds.edn")) , repl error said no such namespace: edn

I would posit too that a clojurist reading clojure code would understand if they saw something like (when-let [foo (seq (get-data))] ... ) would know what's going on 🙂

Hi https://github.com/SparkFund/google-apps-clj i've tried to follow steps : Obtaining OAuth 2 Credentials but stuck at step 6, i've create the google-creds.edn, where should i save this? whenever i called (edn/read-string (slurp "config/google-creds.edn")) , repl error said no such namespace: edn

You need to bring in the edn namespace,

i.e.,

(require '[clojure.edn :as edn])

user=> (require '[clojure.edn :as edn])
nil

user=> (edn/read-string (slurp "/home/david/foo.edn"))
{:foo [1 2 3]}

does clojre.edn , the "clojure" can be changed with my project name? (require '[asdf.edn :as edn])

No, it's a "core" library, part of clojure

it's namespace is clojure.edn

ohh okay noted

it's like, in java doing an import java.time.LocalDate

np

@dharrigan then in step 9 how do i call google-apps-clj.credentials/get-auth-map?

I would imagine, without knowing the api at all, something like this:

https://github.com/SparkFund/google-apps-clj/blob/develop/test/google_apps_clj/google_drive_test.clj#L5

Their tests sorta show how it works

https://github.com/SparkFund/google-apps-clj/blob/develop/test/google_apps_clj/google_drive_test.clj#L8

.

so instead of calling default-credential you call get-auth-map passing in the slurped data from the edn file

(gauth/get-auth-map (edn/read-string (slurp "/home/adrian/my-credentials.edn")) scope)

with scope set to be "<https://docs.google.com/feeds/>" or one of the other examples

I'm lost here... Apologize bcs I'm still newbie here. I'd like to ask when we put this [google-apps-clj "0.6.1"]within dependencies in project.clj then i run lein deps in my cmd. it's kinda installing/downloading, where this library stored?

that's okay, we're all beginners 🙂

Okay, so you are using leiningen, you have a project.clj?

or are you using deps.edn?

i use project.clj

Take for example, the google apis project.clj

https://github.com/SparkFund/google-apps-clj/blob/develop/project.clj

you can see that the dependencies are in a block called dependencies

in your project, you would add in the google-aps-clj into your dependencies block

make sense?

yes, i've add [google-apps-clj "0.6.1"] in my dependencies block

great

so, now you can do lein repl to bring up a repl for experimentation

yes

great, so now you can require in the various libraries for playing around, such as the google apps library

this

my repl now ready

very good, now you can add in the requires, think of "imports" like you would in java

their tests, which I linked previously, shows how to import their libraries

there's no namespace called edn

read-string is a function that exists in clojure.edn : Check out the examples here: https://clojuredocs.org/clojure.edn/read-string

OHHHHHHHHHHHH... like this? since i'm going to use google sheets, i take the require from https://github.com/SparkFund/google-apps-clj/blob/develop/test/google_apps_clj/google_sheets_v4_test.clj

not quite, nealry

you don't ns their stuff

you require it into yours

sorry, this is revised

Let me show you...

yes

that is better

now you have their stuff required into your namespace

that should get you going now 🙂

i got an error with the ns from here https://github.com/SparkFund/google-apps-clj/blob/develop/test/google_apps_clj/google_sheets_v4_test.clj i'll try with another

this one works

It's okay, it's a warning

step 9 still is really confusing.

it doesn't result anything in repl.

You're not using the function step 9 is telling you to call.

I'm sorry, but how to call it?

Is this your first time using Clojure may I ask?

Sadly yes.. I'm learning from braveclojure until ch 9 now

apologize if i really don't understand... i never touch java either

I think, learning to do oauth2 authentication to google, is a big big step

Could you start with something smaller perhaps? Learn how to invoke functions, passing in arguments?

loading (requiring) in namespaces and working with the functions defined within them?

okay noted.

Very happy to help, but it does seem like more basics are required first, until you tackle the beast that is oauth2

and trust me, oauth2 sucks

allright, i'll re-learn again about the :require once i could do the csv api, but this google things... is very difficult

agreed

🙂

I would also recommend the <https://practicalli.github.io/> courses

they are good too

ahhh okay, thank you so much for the help... step 9 is like last boss... i'll go levelling first

np

Hi all. I have 2 namespaces implementing the same functions and I'm trying to dynamically select one based on a configuration entry. I don't really want to get into dependency injection frameworks, interfaces, protocols and all of that stuff unless I have to. I've figured out that this seems to work: (let [namespace (if some-config-flag 'namespace1 'namespace2)] (require [namespace :as implementation])) (implementation/do-something) Is this considered a sensible thing to do, or an abominable hack?

closer to the latter :)

can you just require both? (if (= option :a) (the-a-choice/launch-missles) (tests/launch-console-text-missiles))

using requiring-resolve with a fully-qualified var would be better

I have a use case that I do for this, and yup, Alex beat me to it, (requiring-resolve)

assuming you need the dynaload

I have about 20 functions in the implementing namespace, and it's something that is used very heavily in my app (the main persistence module). does requiring-resolve make sense for that or would it have a high runtime overhead?

also I don't need to load it dynamically - both implementations will be present in the released package

I mean, from what you describe, I'd probably use a protocol

and just use config to choose what to instantiate

doing the conditional require stuff makes it a lot harder for editors, tools, etc to understand what you're doing (and possibly other developers as well)

Thanks - yes I did notice that clj-kondo didn't like what I was doing 🙂 I was put off protocols thinking they were really intended just for java interop, but it looks to me like the best match

I know very little about web application security, but I'm trying to learn more. I know it is normal to protect certain parts of an application, and require the user to be authenticated in order to be authorized to see whatever is protected. But what if I also wanted to encrypt the information going into the system from the client, so that the database administrator or someone who gained entry to the database would not be able to see whatever was stored there. Is this feasible, or common? Can the information be decrypted fast enough for the system to respond like a normal web application, or would that process be very slow? Does anyone know of any good resources for doing things like this in Clojure, or just a general overview of web application security? So far I have found this: https://purelyfunctional.tv/article/clojure-web-security/

in my experience, encryption all the way to the database level is rare

however, saying that, I know that our AWS RDS instances do encrypt the storage underneath

however, that's at the block level, not at the application level, so I can easily psql into a RDS instance and do normal selects etc...

our internal API calls are all TLS (which makes debugging a bit difficult, unless you plug in a MITM on your work machine 🙂 )

however, this is probably better discussed in #off-topic 🙂

given a hypothetical database that stores encrypted data, it would need to decrypt it to do all the good things databases do (build indices, enforce constraints, etc). so the database will need to be able to decrypt it, which means if someone has the highest level access to the database (typical of a database admin) that means they can also decrypt it

so no, not feasible

if you aren't interested in a database, and just want a blob key value store, it is feasible. if you aren't familiar, and haven't work with something like a sql database before, you might equate a database with a key value store, but they definitely are not the same thing

Thanks, this has given me something to consider!