adds script to resolve chained requests

src/chained_requests.py

@@ -0,0 +1,43 @@
+import os, json, requests
+from getpass import getpass
+from classes import Header
+
+'''
+Starting from the sample's page we'll use this code to pull and return all data from the entries related to the sample and its fabrication.
+'''
+
+class Entrypoint:
+    '''
+    Use: Entrypoint(elabid)
+
+    The entrypoint is the starting point of the process of resolving the data chain. The entrypoint must be a sample.
+    
+    Currently, the elabid of the sample must be provided. In the future a different method will eventually be implemented.
+    '''
+    def __init__(self, elabid):
+        '''
+        Constructor method.
+        self.sample_data is a dictionary of all data on the sample's eLab entry.
+        self.linked_experiments is a sub-dictionary which only includes links to related experiments.
+        self.batch_elabid is an integer (or NoneType if there's an error) containing the elabid of the associated substrate batch entry.
+        '''
+        header = Header(apikey).dump
+        self.sample_data = requests.get(
+            headers = header,
+            url = f"https://elabftw.fisica.unina.it/api/v2/items/{elabid}",
+            verify=True
+        ).json()
+        self.linked_experiments = self.sample_data.get("related_experiments_links") or None
+        try:
+            self.batch_elabid = self.sample_data["metadata_decoded"]["extra_fields"]["Substrate batch"]["value"]
+        except KeyError as k: # if no metadata exists - which means there's a problem with the entry
+            self.batch_elabid = None
+
+if __name__=="__main__":
+    print("===== DEBUG MODE! =====")
+    apikey = getpass("Paste API key here: ")
+    elabid = input("Input elabid here [default = 1108]: ") or 1108
+    chain = Entrypoint(elabid)
+    print(json.dumps(chain.sample_data))
+    print(json.dumps(chain.linked_experiments))
+    print(chain.batch_elabid)