CATERING OPENED CABIN DOOR OF B737-700 PRIOR TO DOOR BEING FULLY DISARMED. FA WAS ABLE TO DETACH GIRT BAR BEFORE ESCAPE SLIDE DEPLOYED.

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BOARDING COMPLETED; AGENT READY TO CLOSE DOOR; I ANNOUNCED OVER THE PA 'FLT ATTENDANT READY CABIN FOR DOOR CLOSURE;' WENT AND ARMED R1. I WAS JUST GETTING READY TO CLOSE L1; AND IT OCCURRED TO ME THAT I HAD NOT BEEN CATERED YET. I RAN OVER TO DISARM R1. I WAS ABLE TO REMOVE THE GIRT BAR FROM THE FLOOR; BUT AS I WAS TRYING TO SECURE THE GIRT BAR INTO THE DOOR; THE CATERER OPENED THE DOOR. HE DID NOT KNOCK AND THE RED STRAP WAS ACROSS THE WINDOW. I YELLED THROUGH THE CRACKED DOOR FOR THE CATERER TO STOP AS THE DOOR WAS NOT DISARMED YET AND I NEEDED TO FINISH SECURING THE GIRT BAR TO THE DOOR. MY R WRIST AND FOREARM WERE INJURED AS I WAS TRYING TO SECURE WHILE HE WAS OPENING THE DOOR. THE CATERER WAS MOVING IN 'HYPER MODE' WAY TOO QUICKLY. WE MENTIONED TO HIM TO SLOW DOWN A BIT. A QUICK NOTE; JUST PRIOR TO THIS BOARDING; ENRTE TO ZZZ WE WERE EXPERIENCING A SCARY MEDICAL AND WERE ALL STILL SHAKEN FROM THE EXPERIENCE. MY NERVES DID NOT SETTLE DOWN UNTIL 1/2 WAY TO ZZZ. PLEASE NOTE THAT THE SLIDE NEVER DEPLOYED; BUT I WAS NEVER ABLE TO PROPERLY SECURE THE GIRT BAR PRIOR TO R1 BEING OPENED.